Search engines like Google work through a process known as web crawling and indexing. Search engine bots, also called spiders or crawlers, continuously scan the internet to discover and index web pages. These bots follow links, collect information, and build an index of keywords and content. When a user enters a search query, the search engine's algorithm retrieves relevant pages from its index based on factors like keyword relevance, content quality, and user engagement. The search results are then ranked based on these criteria to provide users with the most relevant and useful information.