SEO is the work of making a website easier for search engines to find, understand and recommend, so that more of the right people arrive without you paying for each click. It covers the technical health of the site, the words on its pages and the links and mentions it earns elsewhere.
It is not a trick and it is not a switch. Search engines reward the site that answers a question best and is easiest to trust, so most SEO work is ordinary: fixing what is broken, writing what customers actually search for and earning a mention from people who matter in your area or trade.
