What is SEO in marketing and how does it work?

6 June 2026 · By John Carlsson

SEO in marketing is improving a website so it appears higher in unpaid search results. Search engines rank pages by how relevant they are to the search and how far they can be trusted, which comes from technical health and links from reputable sites. Unlike paid adverts, a well-ranked page can keep bringing visitors after you stop spending.

SEO in marketing is the practice of improving a website so it appears higher in unpaid search engine results, by aligning the site with the factors search algorithms favour — relevant keywords, technical health, mobile usability, and credible backlinks.

How search engines decide rankings

To understand how SEO in marketing works, start with rankings: when someone types a query, search engines assess an enormous number of pages and rank them by a combination of relevance and trust signals. Relevance comes from how well a page's content matches the intent behind the search. Trust comes from technical health (a fast, secure, well-structured site) and external validation (other reputable sites linking to yours).

Why SEO sits inside marketing

SEO is considered a marketing discipline because, unlike paid advertising, it compounds over time rather than stopping the moment you stop paying. A well-optimised page can continue attracting organic traffic for years with minimal ongoing spend, which makes it a cost-efficient complement to paid channels rather than a replacement for them.

Putting SEO in marketing into practice

In practice, this means marketing teams research what their audience searches for, create content that genuinely satisfies that intent, ensure the technical foundation doesn't get in the way, and build genuine authority through partnerships, PR, and outreach that naturally earns links over time.

Why algorithms keep changing

Search engines continuously refine their ranking algorithms to better detect genuine quality and penalise manipulation tactics. This means SEO is not a one-off project but an ongoing practice — a site optimised perfectly for today's algorithm may need adjustment as search engines get better at understanding content and user intent over time.

How SEO connects to the wider customer journey

SEO rarely operates alone within a marketing strategy. A visitor who finds a business through organic search might then be retargeted with paid ads, added to an email list, or referred by social proof gathered elsewhere. Treating SEO as the entry point into a wider marketing funnel, rather than an isolated channel, tends to produce stronger overall results.

Why patience is part of how SEO works

Unlike paid advertising, where results are visible almost immediately, SEO inherently involves a delay between effort and outcome — search engines need time to re-crawl pages, evaluate new content against existing competition, and gradually adjust rankings. Marketing teams that understand and plan around this delay tend to commit to SEO consistently, rather than abandoning it prematurely after a few quiet months.

A common misunderstanding about how SEO works

A frequent misunderstanding is treating SEO as something that can be switched on quickly before a launch and then left alone. Because rankings depend on accumulated trust and relevance signals built up over time, SEO works far better as a continuous, ongoing practice integrated into regular marketing activity than as a one-off pre-launch task.

Key Takeaways

SEO works by aligning a site with the relevance and trust signals algorithms favour.
It compounds over time, unlike paid advertising which stops the moment spend stops.
Algorithms change continuously, so SEO is an ongoing practice, not a one-off project.

Frequently asked questions

How do search engines decide which pages rank highest?

When someone types a query, search engines assess an enormous number of pages and rank them using a combination of relevance and trust signals. Relevance comes from how well a page's content matches the intent behind the search. Trust comes from technical health, meaning a fast, secure and well-structured site, and from external validation, where other reputable websites link to yours. Search engines also continuously refine their algorithms to better detect genuine quality and penalise manipulation tactics, so a site optimised perfectly for today may need adjusting as search engines improve at understanding content.

Why is SEO considered part of marketing?

SEO is treated as a marketing discipline because, unlike paid advertising, it compounds over time rather than stopping the moment you stop paying. A well-optimised page can keep attracting organic traffic for years with minimal ongoing spend, making it a cost-efficient complement to paid channels rather than a replacement for them. It also connects to the wider customer journey: a visitor who finds a business through organic search might later be retargeted with paid ads, added to an email list or influenced by social proof. Treating SEO in marketing as the entry point to a wider funnel tends to produce stronger results.

How long does SEO take to work?

SEO involves a delay between effort and outcome, unlike paid advertising where results appear almost immediately. Search engines need time to re-crawl pages, evaluate new content against existing competition and gradually adjust rankings. Marketing teams that understand and plan around this delay tend to commit to SEO consistently, instead of abandoning it after a few quiet months. A common misunderstanding is treating SEO as something to switch on before a launch and then leave alone. Because rankings depend on accumulated trust and relevance signals, SEO works far better as a continuous practice built into regular marketing.