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Computer scientists may classify database-management systems according to the database models that they support; the most popular database systems since the 1980s have all supported the relational model - generally associated with the SQL language.Formally, a "database" refers to a set of related data and the way it is organized.Hardware database accelerators, connected to one or more servers via a high-speed channel, are also used in large volume transaction processing environments.DBMSs are found at the heart of most database applications.On the other hand, a general-purpose DBMS may introduce unnecessary overhead.Therefore, many systems use a special-purpose DBMS.This article is concerned only with databases where the size and usage requirements necessitate use of a database management system.

The relational model employs sets of ledger-style tables, each used for a different type of entity.Databases are used to hold administrative information and more specialized data, such as engineering data or economic models.Examples of database applications include computerized library systems, flight reservation systems, computerized parts inventory systems, and many content management systems that store websites as collections of webpages in a database.A general-purpose DBMS allows the definition, creation, querying, update, and administration of databases.A database is not generally portable across different DBMSs, but different DBMSs can interoperate by using standards such as SQL and ODBC or JDBC to allow a single application to work with more than one DBMS.

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