What is SERP?
Search Engine Results Page: the page displayed by a search engine in response to a query. A SERP typically contains organic results (ranked by relevance), paid ads, and rich result features like featured snippets, knowledge panels, and "People also ask" boxes.
My perspective
In practice
SERP features have expanded well beyond ten blue links: star ratings, FAQ accordion results, image carousels, and now AI Overviews dominate above-the-fold space. Understanding which SERP features your content can win is a key step in any SEO strategy.