Most people think SEO is manipulating Google’s algorithm to climb the search results (the levers and switches approach). This is not the case. The true meaning of SEO in marketing is more simple and less exciting. SEO stands for Search Engine Optimization and means enhancing a website so that search engines (such as Google) can understand it and show its pages in the unpaid, organic results. You don’t pay per click. The pages shown are based on what is most useful to the user.
What does this mean? For a simple example, let’s say someone is searching how to get coffee stains out of a shirt. The page that wins is not the home page of the detergent brand. The page that wins is a single article on a website with a track record in laundry, that is fast loading on a phone and has a page title with the search query “how to get coffee stains out of a shirt.” There was no ad spend. This is SEO.
What does SEO stand for, and what does SEO mean in marketing?
SEO stands for Search Engine Optimization. This is a tricky one because the term gets thrown around multiple ways, which is why a lot of people get confused by it. So SEO can mean: the activity (“we’re doing SEO”), the discipline (“she works in SEO”), and the job title (“she’s our SEO”).
Google provides their own definition of SEO in the Google Search Central SEO Starter Guide, and it is the most authoritative definition of SEO available, so it’s worth quoting rather than paraphrasing. Google says SEO is “about helping search engines understand your content, and helping users find your site and make a decision about whether they should visit your site through a search engine.”
Search + Engine + Optimization: what each word is doing
Separating the three words of SEO helps with understanding.
- Search — this is a person doing a query. There is an intent behind every query.
- Engine — Google, Bing, YouTube, Amazon: systems that index content and show ranked results.
- Optimization — modifying the page, the site, and its reputation so the engine picks it.
Organic results vs paid ads: the line SEO sits on
SEO concerns only the free, organic listings that show on a search engine results page (SERP). Paid listings appear above the free results, and are governed by a completely different set of rules and budget. And most definitions fail to mention that SEO now encompasses the web and all of the verticals that search engines cover including images, videos, academic, news, etc. and including all of the other AI assisted search interfaces beyond Google’s blue links.
The one-sentence version you can say out loud in a meeting: SEO is the practice of improving a website’s visibility in a search engine to drive relevant free traffic, so the website is the answer to a user’s question.
Where did the term “SEO” come from?
Many definitions write in the present tense, never saying where the term came from. Figuring out the source explains the reason for the confusion. The phrase “search engine optimization” was first used in 1997 and was coined by practitioners, not by Google, which did not yet exist as the dominant engine.
No single person has been acknowledged as the coiner. The more forthright versions describe the different people and groups who have laid claim to the phrase. John Audette of the Multimedia Marketing Group was using the phrase in print as early as February of 1997. Bob Heyman and Leland Harden came up with it while running the website for the rock band Jefferson Starship, after the band’s manager complained that the band’s website ranked on page four of a search. Danny Sullivan credits Bruce Clay as one of the first people to popularize the term.
From “positioning” to “optimization” — why the word changed
Sullivan had a hand in changing SEO vocabulary himself. In 1998, he changed a page titled “Search Engine Positioning” to “Search Engine Optimization.” This single page edit defined the industry’s language.
It also predicted the direction of travel. With positioning he meant manipulating a webpage to a higher ranking. With optimization he meant making improvements to the page itself. One is manipulation, the other is work.
How the meaning quietly stretched between 1997 and 2026
Originally the goal was to rank a webpage on a list of ten blue links. Then the focus moved to other forms of content and ranking including images, video, news, local, and shopping. Now the emphasis is on being surfaced by any search or AI answer interface. Same three letters, a much wider job.
This is why SEO is so confusing for beginners. The definition they’re given is from 1997, yet they’re told that definition is wrong — they’re handed a 1997 definition for a 2026 job. Learn the mechanism instead of the tactic list, and definitions for SEO stop going out of date.
How do search engines actually work?
The definition is meaningless until you know what you’re optimizing for. There are three stages: Crawling, Indexing, and Ranking.
Crawling. Crawling is the discovery stage. Bots discover and download URLs, mostly by following links from pages they already know. Pages that are not linked to and not pointed out to a crawler may never be discovered.
Indexing. Once a page is discovered, it’s analysed and, if it qualifies, stored in a vast database of possible results. Being crawled is not the same as being indexed — not all crawled pages are indexed, and that catches people out constantly.
Ranking. For a query, search engines must understand the search intent behind it, then algorithmically select the best results from the index. Having the right keywords does not guarantee a page will be ranked #1 for a query, because there is no fixed score and no guarantee of position one.
Each stage creates its own work. Crawling and indexing are mostly technical SEO. Ranking is where content quality, keywords and search intent, backlinks and E-E-A-T (experience, expertise, authoritativeness, trustworthiness) do their work. When systems determine that one page best satisfies a search, that system is the algorithm — it isn’t a checklist you satisfy, it’s a set of systems estimating which page best serves the person searching.
SEO vs SEM vs PPC vs GEO: which terms mean something different?
You’ll learn 4-5 new acronyms in a week and most resources explain 2 of them at a time. Here they all are together.
| Term | What it covers | Paid or unpaid | Verdict |
|---|---|---|---|
| SEO (search engine optimization) | Earning visibility in the organic listings | Unpaid | A real discipline |
| PPC (pay-per-click) | Buying the ad slots on the same results page | Paid | A real, separate discipline |
| SEM (search engine marketing) | Visibility from search overall | Both | The umbrella term, not a third skill |
| GEO / AEO (generative / answer engine optimization) | Being surfaced in AI answers | Unpaid | A relabeling — Google calls it SEO |
The pecking order in the writing: SEM is at the top covering search visibility as a whole. SEO (organic) and PPC (paid) are underneath it as the two ways to reach the same results page, which is explained similarly in Backlinko’s SEO vs SEM breakdown.
GEO and AEO warrant an answer, because the pitch decks are noisy. On 15 May 2026, Google officially published guidance saying “from Google Search’s perspective, optimizing for generative AI search is optimizing for the search experience, and thus still SEO” — as reported by Search Engine Journal. Google has absorbed both of these into SEO rather than creating a new field for them.
So understand SEO and PPC as two different lines in the budget. Do not hire for GEO and AEO separately.
What are the three types of SEO, and what does the work look like?
The standard division is into three categories.
On-page SEO — involves optimizing individual pages for a given keyword that a prospective customer uses in a search. This encompasses title tags, meta descriptions, URLs, headings and internal linking.
Off-page SEO — involves trust and authority signals from external pages. This is primarily backlinking, as well as E-E-A-T and brand mentions.
Technical SEO — revolves around helping search engines crawl and index a site at all, including site speed and site structure.
Some frameworks add a fourth category of user interaction signals. That’s a framing choice, not a separate department.
What an SEO does in a typical week
The abstractions get concrete quickly. This includes activities such as keyword research, on-page content creation and improvements, title and meta descriptions improvements, internal link building, earning backlinks, repairing crawl and speed problems, and reporting on rankings and organic traffic.
This person also identifies why pages do not rank, writes briefs for content creators, works with developers on technical updates and fixes, and reports on how organic traffic impacted revenue. Part analyst, part editor, part project manager. The job overlaps heavily with content marketing, which supplies the pages; it feeds email and social, which distribute them; and it competes with paid search for the same clicks on the same SERP. Moz, Ahrefs and Semrush are not prerequisites to launching your SEO efforts — you’ll easily meet these keyword and backlink data tools early on.
Does SEO still work now AI Overviews answer the query?
Fair question, and it deserves numbers rather than vibes. Ahrefs analyzed 300,000 keywords — 150,000 with an AI Overview present, 150,000 informational keywords without — and found that AI Overview presence correlated to a 34.5% lower average click-through rate for the top ranking page. Position 1 for informational keywords dropped from a click through rate of 0.056 in March 2024 to 0.031 in March 2025. Later, the same analysis was updated, and the position one drop was 58%. This is the range to consider, based on the named study, not a settled figure.
The interpretation is what matters most, more than the headline. Informational queries lose the most clicks; commercial and transactional lose far less. So what SEO is worth now depends heavily on what your pages are for. A plumber who ranks for “emergency plumber [city]” gets the customer without paying per click, and the next one the next day. That compounding is the whole value proposition.
The AI-search advice you can safely ignore (for now)
One thing no definition page tells you: the “You need an AI-search strategy” pitch doesn’t apply to small site owners or new content creators. Google’s guidance says llms.txt, content chunking, AI-specific rewriting, and special schema are not needed to appear in its generative AI features, and that there are no additional requirements beyond normal SEO. Google’s SEO Starter Guide is written, in its own words, “not for SEO professionals, but rather newish website owners and other content creators.” If this applies to you, get the basics right before buying an AI-optimization stack.
The SEO words you’ll hit next
You’ll see these six words in your next SEO article. One line each.
- SERP — the search engine results page.
- Keyword — what is being searched and what is the intent.
- Backlink — a link from another site, treated as a vote.
- Algorithm — what systems determine what to show.
- Indexing — being stored in the engine’s database of possible results.
- E-E-A-T — experience, expertise, authoritativeness, trustworthiness; Google’s shorthand for whether a source should be trusted on a topic.
Day one focuses on basics such as keyword, SERP and indexing. Backlink and E-E-A-T only start to matter once you’re producing content.
The one thing to remember
SEO means search engine optimization: building a site engines can understand and people choose from the unpaid results. Marketers coined the term in 1997 to describe ranking a page on a list of links, and the definition has stretched ever since — across images, video, local, now AI answers — without the three letters ever changing. That’s why competing definitions feel contradictory. They’re snapshots from different years of the same job.
Your next step: open Google’s free SEO Starter Guide, written for site owners rather than specialists, and apply its three basics to a single page you already own. Check to make sure the page can be crawled. Make sure it’s clear what the page is about. Finally, see if the page genuinely answers the query you want it found for. For other pieces in this vein, see Content Trail HQ.
FAQ
Is SEO part of digital marketing?
Yes. SEO is a channel of digital marketing and falls within the umbrella of search engine marketing (SEM), alongside paid search. It overlaps heavily with content marketing, which produces the pages SEO optimizes, and it feeds email and social, which distribute them. It also competes directly with PPC for clicks on the same results page.
Can I do SEO myself, or do I need to hire someone?
You can definitely do the basics yourself, and for a small or new site you should. Google’s SEO Starter Guide is written explicitly for newish website owners and content creators rather than professionals, and the core of SEO is about making pages crawlable, clear about their topic, and genuinely useful. You don’t need to pay for tools to achieve that. Hiring makes sense when the technical problems outgrow you or the content volume does.
How long does SEO take to work?
No one can really say for sure, and a quote that is too specific is probably just a guess. The mechanism explains why: a page has to be crawled, then indexed, then judged against everything already ranking for that query — and the engine re-evaluates continuously rather than scoring you once. No final score is assigned. It may be best to think of SEO as compounding work, rather than a campaign with an end date.
