A database is an organized collection of data. The data is
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 computer software
applications that interact with the user, other applications, and the database
itself to capture and analyze data. A general-purpose DBMS is designed to allow
the definition, creation, querying, update, and administration of databases.
Well-known DBMSs include MySQL, PostgreSQL, Microsoft SQL Server, Oracle, SAP
and IBM DB2. 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. Database
management systems are often classified according to the database model that
they support; the most popular database systems since the 1980s have all
supported the relational model as represented by the SQL language. Sometimes a
DBMS is loosely referred to as a 'database'..
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