Indexing in SEO is the process of adding web pages to a search engine's database. It's like indexing a book. This helps search engines find the page quickly when someone searches for something related. When a page is indexed, it can be found in search results. This is important for making sure a website can be seen on search engines. Search engines use crawlers to find and index pages. This means they analyze and store the page's content and metadata. Good SEO strategies make sure all important pages are indexed and easy for search engines to find.