- Relational databases
Relational databases became dominant in the 1980s. Items in a relational database are organized as a set of tables with columns and rows. Relational database technology provides the most efficient and flexible way to access structured information.
- Object-oriented databases
Information in an object-oriented database is represented in the form of objects, as in object-oriented programming.
- Distributed databases
A distributed database consists of two or more files located in different sites. The database may be stored on multiple computers, located in the same physical location, or scattered over different networks.

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