If we want to find specified information in a database, the most common method to use would be the search engine, otherwise known as an information retrieval (IR) system. Examples of search engines include Google, Bing, Yahoo!, Blekko, and many others. The search engine consists of four important modules: document processor; query processor; search and matching function; ranking capability. The document processor’s role is preparing, processing, and inputting document, pages, or site that users want to find. Query processing is when a system uses several steps to match the query to the inverted file during the processing. Searching and matching function is usually a standard binary, search and looks for inverted files for documents to meet with query requirements. After that comes the ranking, an ordered list of search results presented to the user. For example, Wikipedia would show up as one of the top results during a search process. Search engines are a useful feature to have and without them, it would be hard to find the required information you want in the pile of databases.
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