A SERP is the search engine results page you see after typing a search. It once held ten blue links. Today it can stack ads, a map with three businesses, an AI-written summary, a box of questions, shopping tiles and videos before the first ordinary listing, so where your page sits on it matters as much as whether it ranks.
Every search has its own SERP. A search for 'plumber' in your town shows a map pack. A search for 'how to fix a dripping tap' shows videos and an AI summary. A search for a brand name shows that brand's site with extra links. Knowing which layout your customers get tells you which part of the page you are competing for.
