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Ask what is search engine marketing and you will be told it is the paid half of search, or that it is search in general, or that it is a tidier word for pay per click. All three answers are in circulation, which is the whole problem.
It matters because of what it does to a quote. One supplier prices search engine marketing as ad management and another prices it as everything that happens on a search engine, and the reader holding both cannot tell whether the same work is on two invoices.
This post is written for that reader rather than for a marketing department. Here is the plain definition, what a quote contains, and how it sits against the unpaid side of the same job. The paid side is the one we run as a service, though the field is larger than any supplier's version of it, ours included.
Search engine marketing (SEM): what is it, in simple words?
In simple words: you pay a search engine to put your listing in front of somebody at the moment they search for something, and you pay each time one of them clicks through. The listing is marked as an advert. It appears because you bid, not because the search engine judged you the better answer.
That is a narrow definition of a wide activity, and the scale behind it is the reason the phrase gets used loosely. Google Search is used by four in five UK adults, on Ofcom's Online Nation figures.
More than 90% of UK searches happen on Google, which is the finding behind the Competition and Markets Authority giving it strategic market status in search and search advertising last October. One company therefore sets the rules of the auction and the rules of the unpaid results beside it.
Search took 44% of UK digital ad spend in 2025 and grew 6% year on year to £17.9bn, on the IAB's Digital Adspend figures. A market that size accumulates several names for the same thing, and this is one of them.
Search engine marketing and SEO, and why the words blur
The confusion is historical rather than anybody's fault. When the phrase entered common use it covered both halves of search, paid and unpaid, with search engine optimisation as one of the two things inside it.
Over time the trade narrowed it to mean the paid half only, because paid and unpaid search turned into separate disciplines with separate people doing them. Both senses are still in use today. Neither is wrong, and that is exactly why a quote needs reading twice.
So the useful move is not to settle the argument but to ask the supplier which sense they are quoting in. If the answer is the narrow one you are buying ad management, and the unpaid side is a separate line you have not been quoted for yet.
| The paid half | The unpaid half | |
|---|---|---|
| Usually called | Search engine marketing, PPC, paid search | SEO, organic search |
| How you appear | You bid in an auction | The search engine judges the page |
| What you pay for | Each click, plus a fee to whoever runs it | The work, whether or not it lands |
| First results | Days | Months |
| When you stop | It stops the same day | It fades slowly |
| What you keep | The data and the account | The pages and the rankings |
Same search box, same query, two entirely different purchases.
What you are actually buying
A quote for search engine marketing contains at least four separate things, and the single number at the bottom hides which is which. Separating them is the fastest way to compare two suppliers honestly.
- The ad spend, paid to the platform rather than to the agency, and yours to set.
- The management fee, paid to whoever runs the account.
- The creative: the words in the adverts, and the extensions under them.
- The landing page the clicks arrive at, which is often nobody's line item and frequently the reason the campaign underperforms.
Ad spend and management fee are different kinds of money and should never arrive merged. What the paid side costs a month is two numbers rather than one, and the unpaid side is priced differently again.
The word buying is doing something specific here. You are entering an auction, not purchasing a position. Google's Ad Rank documentation describes values worked out at the moment of each search, from your competition, the context of that search and your advert quality.
Nobody can sell you a place on the page, because the place is decided after the search happens. A supplier promising position one has promised something they do not control.
What is the primary goal of search engine marketing?
The goal is commercial rather than positional: enquiries, bookings or sales from people who were already looking for what you sell. Appearing is the mechanism, not the outcome.
This is worth saying plainly because campaigns get reported on the mechanism. Impressions, clicks and click-through rate describe the machinery working, and none of them is the thing you were after. The format itself is simple enough; judging it is where people come unstuck.
A month of search engine marketing is worth what it returned, measured against what it cost including the spend. If a report does not put those two figures on the same page, it has answered an easier question.
Which one your problem needs first
Both halves answer the same question on different timescales, so the sequencing follows from your deadline rather than from fashion. Paid is right where the unpaid side will not answer inside three months.
Say the problem out loud and it usually sorts itself. Needing customers this quarter is a different sentence from wanting to stop paying per click eventually, and the two sentences buy different things.
| What you would say out loud | Which half answers it |
|---|---|
| We need enquiries before the end of the quarter | Paid |
| We spend a fortune on clicks and want to stop | Unpaid |
| Nobody has heard of us and nobody is searching for us | Neither yet |
| We rank well and still get nothing | The landing page, before either |
| We are launching something nobody searches for | Neither yet |
| We want to be there for a term we will never rank for | Paid, indefinitely |
Two of the six rows are not a search problem at all, which is a legitimate answer.
Sometimes the answer is neither
Neither half is compulsory, and it is worth hearing that from somebody who has run a business without either. A UK owner in r/smallbusinessuk, in a thread on whether a business can be grown on social media alone, answered from nearly twelve years of never having advertised at all.
I've ran my business for nearly 12 years across specials/website and have never paid for advertising. It's organically grown through word of mouth so it's definitely do-able!
A UK business owner, r/smallbusinessuk, June 2026
That is one business in one trade and not a rule, but it is a useful corrective to a quote that treats paid search as the only door. Word of mouth is a demand channel too, and it does not appear on any invoice.
What search engine marketing is not
It is not a way to influence your unpaid rankings. Money spent in the auction buys advert placements and nothing below them, and the two systems are separate by design rather than by policy.
It is also not a substitute for the page the clicks land on. A campaign sending people to a slow or unclear page is charged for every one of those clicks regardless.
And it is not permanent. The unpaid side leaves pages and rankings behind when the invoices stop, where the paid side leaves an account, a history of what converted, and silence.
If you are holding two quotes and still cannot tell whether they overlap, that is a twenty minute conversation rather than a project. We are happy to read them with you and say which half each one covers.