Google Search Engine
Search engines are a set of algorithms used to search for information within a specific domain and organize that information in a database. People often use this term in reference to Internet search engines, which are specifically designed to search the Internet. These programs help people to organize and display information in a way that makes it readily accessible. There are three aspects to a search engine: crawling, indexing, and searching. When one crawls, it looks for new content that was not present during the last crawl, including updates to files and web pages. Then, the programs index the information, pulling out specific keywords to categorize it. On the Internet, for example, indexing relies heavily on keywords in web pages and meta tags that provide information about the page. Once the information has been indexed, information about how to access it is stored in a database. When someone searches the database, it displays results ranked by relevance.