Search engine optimization (SEO) is the ongoing practice of improving a website so it earns higher visibility in the unpaid results of search and answer engines. It spans technical health, content quality, and off-site authority, all aimed at matching what real searchers want.
The goal has widened from "rank in the blue links" to "be the source an answer engine cites." That means demonstrating E-E-A-T (experience, expertise, authoritativeness, trust), structuring content so AI systems can extract and quote it, and earning a place inside AI Overviews and chatbot answers. A concrete win still looks familiar, though: a service page stuck on page three at position 24 is rebuilt around clearer intent, given supporting internal links, and earns a few quality citations — three months later it sits at position 4 and its clicks jump roughly seven-fold. That measurable movement is what an SEO audit and a focused program are built to produce.