Search engine optimisation (SEO)
Short definition
SEO is the ongoing technical and content work that helps a website rank higher in a search engine's free, organic results.
Search engine optimisation shapes how a site is read by engines such as Google, which keywords it matches, and how trustworthy it looks to a visitor. Technical SEO governs whether the site can be crawled at all, content SEO decides whether it actually answers what someone typed, and a site's backlink profile signals how much the wider web vouches for it.
SEO is not a one-off setup but ongoing maintenance. A competitor's content refresh, an algorithm update, or a shift in how people search can move rankings within weeks. It is often confused with advertising, but advertising rents a spot for every click, whereas SEO builds a position that keeps earning visits long after the work is done.
The result of SEO work need not be guesswork: Google Search Console shows which queries a page appears for, how often it gets clicked, and which pages never made it into the index at all. A common mistake is watching only the position number; if that stays steady while click-through rate falls, the page may no longer be answering what searchers actually want.
Why it matters
Organic search is usually the lowest-cost, most durable source of new customers a business has. Turn off an ad budget and traffic stops the same day; a ranking built through SEO keeps producing value for months afterwards.
Illustrative example
A flooring manufacturer rewrote its product pages around what buyers actually search for and started receiving more quote requests on the same budget, because the pages finally answered the visitor's real question.
