A database is an organized collection of data The data are typically organized to model aspects of reality in a way that supports processes requiring information. For example, modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies.
Database management systems (DBMSs) are specially designed software applications that interact with the user, other applications, and the database itself to capture and analyze data. A general-purpose DBMS is a system designed to allow the definition, creation, querying, update, and administration of databases. Well-known DBMSs include . A database is not generally across different DBMSs, but different DBMSs can interoperate by using such as and to allow a single application to work with more than one DBMS. Database management systems are often classified according to the that they support; the most popular database systems since the 1980s have all supported the as represented by the language.