A query language is a programming language used to communicate with databases and retrieve the necessary information. Synonyms for query language include database language, data query language, and data manipulation language. These languages all serve a similar purpose, allowing users to interact with databases and manipulate data. SQL, or Structured Query Language, is the most widely used query language and is often considered the standard. Other query languages include RQL, XQuery, and SPARQL, each with its own syntax and specialized features. Regardless of the specific language used, the power of query languages lies in their ability to efficiently and accurately extract data from large databases.