Search engines were designed to understand, discover, and organize the internet’s content in order to provide the best search results to search queries made by searchers. Not all domain owners know whether their site’s pages have been discovered by search engines (Google, Bing, Yahoo, Baidu, etc.); many don’t even know how to make a quick check. Before a domain’s pages can show up in any search engine’s results, its content has to be first be discovered, interpreted, and recorded or indexed by search engines. If your domain or site can’t be found by search engines, then it won’t be possible for its pages to show up on a search engine results pages (SERPs). This article discusses how search engines gather information from across the internet by the process of “crawling”, and how you can find out whether your domain’s pages are in a search engine’s index.