What Search Engine Marketing Includes

The short answer, and the reason it needs a second sentence

Search engine marketing is everything a business does to appear in front of someone who has typed a query into a search engine. In its original and broadest sense that covers both halves of the result page: the paid listings you buy through an advertising platform, and the organic listings you earn by being the most useful available answer. Under that definition, search engine optimization sits inside search engine marketing, and so does pay-per-click advertising.

The second sentence matters more. A large part of the industry now uses SEM to mean the paid half only, treating SEO as a discipline standing alongside it rather than inside it. Both usages are live, both are defensible, and neither is going to win. So the practical answer is: it depends who is saying it, and the only place that matters is a proposal, where somebody should be made to write down which of the two they mean.

That ambiguity is a commercial hazard, not a curiosity. It is entirely possible to sign a search engine marketing contract believing organic work is included and find out in month three that it never was.

Why the same three letters mean two different things

The term came into use as an umbrella. It was needed precisely because the two halves of a result page were bought separately, by different people, from different budgets, and somebody wanted one word for the whole activity. Under that framing the taxonomy is tidy: SEM is the parent, SEO and paid search are the children.

What eroded it was the growth of the advertising platforms. As paid search became a large, technical, full-time job with its own vocabulary, the people doing it needed a word for what they did, and “SEM” was sitting there. Within advertising teams it became shorthand for the paid work, and the umbrella meaning stopped being the default in that world.

Both usages run side by side today on the pages that rank for the term. One agency's search-engine-marketing page sells SEO and paid management together — the umbrella reading. Another's SEM page carries sections titled “SEO vs. PPC vs. SEM” and “SEM vs. SEO: Do You Need Both?”, which only make sense if SEM means paid, since you cannot contrast a category with something inside it. A third describes SEM services almost entirely in terms of media budget.

My own usage: SEM is the umbrella, because there is no other word for the umbrella and there are already two good words for the halves. But I never rely on that in a scope document.

The paid half, component by component

What people are buying when they buy paid search:

Text ads on search results, bought by keyword and match type, charged by click. Broad match is now the default, and Google is explicit that it matches on far more than the literal words — it uses recent search activity, the landing page, the assets, and the other keywords in the same ad group to infer intent.
Shopping and product listings, driven by a feed rather than keywords, which makes feed quality the primary lever for retailers.
Automated multi-surface campaigns such as Performance Max, which spans Search, YouTube, Display, Discover, Gmail and Maps from one campaign and has documented interaction rules with your search campaigns that catch people out.
Remarketing against people who have already visited.
Bid strategy and budget management — in practice, deciding how much control to hand to automated bidding and what data it is allowed to optimize against.
Conversion tracking, which is not a reporting concern but the foundation the account rests on. If the conversion action is wrong, duplicated, or counting a page view as an outcome, every automated bidding decision downstream is optimizing against a fiction.

The defining property of the paid half: it is a purchase. It starts producing within days and stops the day you stop paying. Nothing accrues.

The organic half, component by component

What people are buying when they buy SEO:

Technical work — whether pages can be crawled, whether they get indexed, whether what a search engine renders matches what a visitor sees, and whether the page-experience measurements are within Google's thresholds. Sites break here silently and often.
Information architecture — what pages should exist, how they are grouped, what each answers, and which of them compete with each other for the same query.
Content — producing pages, and more often improving existing ones that underperform. This is manufacturing and should be costed as manufacturing.
Links and citations — the part of the field with the worst practices attached. Buying links is permissible only when the link is qualified with rel="nofollow" or rel="sponsored"; an undisclosed paid link is a spam policy violation, whoever placed it.
Measurement — Search Console for impressions, clicks and position, analytics for what happened after the click, with the limits of both stated.

The defining property of the organic half: it is an investment with a lag and no assurance attached. Google's documentation says some changes take effect in days and others can take several months, and states directly that there is no guarantee a change will produce a noticeable impact if more deserving content exists.

What gets filed under SEM that does not belong there

Scope creep here is routine, and it is usually how an agreement costs more than it appeared to. Things frequently sold inside a search engine marketing package that are not search marketing:

Paid social. A different buying model against a different intent — someone scrolling a feed did not ask a question. Both can be worth doing; they should not share a performance target.
Display and programmatic. Impression-bought and interruption-based. It sits in the same advertising account, which is why it drifts into search budgets.
Email and lifecycle marketing. Sold to people you already have.
“Digital marketing.” Not a scope. If a proposal's headline category is this broad, the specifics further down are what you are buying — and if there are no specifics further down, there is nothing to buy.

The test: did a person type a query, and is this activity a response to it? If not, it is a different channel with a different case to make.

SEO, PPC and SEM: what the three words actually distinguish

Strip the marketing language and the distinctions are mechanical.

SEO — you change your site and the wider web's relationship to it, and a ranking system decides what that is worth. You do not control placement. You do not pay per appearance. The effect persists after you stop working, then decays.
PPC — you enter an auction, you control placement to the extent your bid and quality allow, you pay per click, and the effect stops the moment the budget does.
SEM — either the category containing both, or a synonym for the second one, depending on the speaker.

What follows is the useful part. Paid search is a lever with a knob on it — turn it up on Monday, see the effect on Tuesday — which makes it the right instrument for testing demand, covering a launch, defending a brand term, handling a seasonal peak, or bridging the gap while organic work matures. Organic is not a lever. It is an asset that gets built, and the reason people persist with it is that cost per visit falls over time instead of rising with competition.

The two common allocation errors are symmetrical. Buying only paid means renting your entire demand indefinitely, at a cost per click that generally goes one direction. Buying only organic means having no way to respond to anything within a quarter.

What the two halves share, which is more than most plans assume

They compete for the same person on the same result page, so a surprising amount of the work is shared — and usually done twice.

Query and intent research. The paid side holds something the organic side cannot get: a search terms report showing the actual queries that produced clicks, with cost attached. That is the best demand data most companies own, and it is routinely locked inside an advertising account nobody on the organic side can open. It runs the other way too — organic impression data across thousands of low-volume queries shows demand nobody is bidding on.

Landing pages. The page that converts a paid click converts an organic one. A page that is fast, clear and answers the question serves both, and the page-experience thresholds that matter for organic affect paid conversion rates too. Building two sets of pages for the same query is a common and expensive duplication.

Measurement definitions. If paid counts a lead at form submission and organic counts it at qualified opportunity, comparing them is meaningless. Agreeing what a conversion is, once, across both, is a half-day of work that prevents a year of arguing.

Brand terms. The one place the two halves actively interfere. Automated campaign types can absorb branded queries you already rank first for and report those conversions as their own. Exact-match keywords in a search campaign take priority over Performance Max; phrase and broad match do not. Brand exclusions exist for this.

What 2026 changed, and how to read a proposal that says SEM

The result page changed under both halves. In a Similarweb-panel study covering January to April 2026, 68.01% of US Google searches ended without any click — a figure that must travel with its caveats: the panel covers desktop and mobile web and excludes the Google mobile app, and the publisher states its multi-year comparisons draw on different panel providers and are not like-for-like. Separately, Ahrefs measured informational keywords showing an AI Overview at a 34.5% lower average click-through rate for the top-ranking page than comparable keywords without one, across 300,000 keywords of desktop Search Console data.

That does not mean search marketing stopped working. It means a click is a scarcer output of a given ranking than it was, which raises the value of queries where somebody is going somewhere to buy — the queries the paid half was always best at — and means impressions and clicks now have to be read as two numbers rather than one story.

So when a proposal arrives with “search engine marketing” at the top, four questions settle it. Does this include organic work, and which parts? Does the fee include advertising spend or sit on top of it? Who produces content, and is it priced here? And what conversion definition will both halves be judged against? A provider who answers those in writing is selling a scope. One who answers with a category name is selling a category.

One more piece belongs inside the umbrella and is routinely left out of these definitions: local search. The map pack that appears for a query with geographic intent is a separate result set with its own ranking inputs — the business profile, its categories, its service areas, and the consistency of the business name, address and phone number across the web. A site can rank well organically and be invisible in the map pack, or the reverse. If your customers search with a place attached, local search is not a subset of the organic work; it is a third channel with its own mechanics.

Frequently Asked Questions

Is SEM the same as PPC?

Not originally, and often not now. SEM began as an umbrella covering both paid and organic search, with PPC being the paid part inside it. Over time many advertising practitioners started using SEM to mean paid search alone, and today both usages are common — you can find agencies using SEM to mean SEO and paid together, and others whose own pages contrast SEM with SEO, which only makes sense if SEM means paid. Treat the term as ambiguous and make any proposal state which parts of the work it covers.

Does search engine marketing include SEO?

Under the original definition, yes — SEO is the organic half of search engine marketing and paid search is the other half. Under the narrower usage that became common in advertising teams, no: SEM means the paid work and SEO stands alongside it. Neither reading is wrong, which is exactly the problem. The commercially important version of the question is whether a specific contract includes organic work, and that is answered by reading the deliverables, not the category heading.

What is the difference between SEM and SEO?

If SEM is being used as the umbrella, the difference is that SEO is one part of it. If SEM is being used to mean paid search, the difference is mechanical: paid search buys placement through an auction, charges per click, appears within days and stops when the budget stops; SEO changes the site and its standing so that a ranking system places it, which cannot be bought, takes longer, and persists for a while after the work ends. Google states plainly that no outcome from the second is guaranteed.

Do I need both paid search and SEO?

Most businesses eventually run both, but not necessarily at once, and starting with both is often a mistake. If you need revenue this quarter, or you have no idea which queries convert, paid answers faster and produces the demand data that makes organic planning sane. If your cost per click is climbing faster than your margin, or you already rank for terms you are currently paying for, the organic side is where the return sits. The wrong answer is buying both at half depth, which usually produces two underfunded programs.

Is SEM still worth it with AI Overviews on the results page?

The evidence supports a shift in emphasis rather than abandonment. Ahrefs measured a 34.5% lower click-through rate for top-ranking pages on informational keywords showing an AI Overview, which hits informational content hardest and commercial queries least. Meanwhile the largest published prevalence study found AI Overview trigger rates peaking in mid-2025 and then falling, so the feature is volatile rather than uniformly expanding. The reasonable response is to weight work toward queries with commercial intent and to read impressions and clicks as separate numbers.

What does a search engine marketing agency actually do?

It depends entirely on which definition they are using, which is why the first question in any conversation should be about scope rather than approach. Some run advertising accounts only: keyword and match-type management, negative keywords, bidding strategy, feed health, conversion tracking. Others run both halves, adding technical fixes, content production and measurement. The distinction is not visible from the service name, and the pages ranking for this term use it both ways, so ask for a deliverables list rather than a category.

Should paid search and SEO be handled by the same person?

They should at least share data and definitions, which frequently does not happen. The paid side holds a search terms report showing which real queries produced clicks and at what cost — the best demand data most companies own — and the organic side usually has no access to it. Both sides also need the same conversion definition or any comparison between them is meaningless. Whether one person or two does the work matters less than whether the two halves are reading the same numbers and are not bidding against pages you already rank first for.

Published 2026-08-11