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Database Management System

A database is a collection of data that conforms to a given structure, and that is managed so that it persists, can be queried, and can be updated.

The thing that manages the database in this way is a database management system, or DBMS, or database system.

Analogy:

• File: Data stored on a disk. Can be opened, closed, read, written, deleted.
• Filesystem: The software that specifies how files are mapped to disk blocks, and implements file operations.

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