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2-A file manager or file browser is a computer progran that provides a user interface to work with file sytems, A Database Management System is a set of computer programs that controls the creation, maintenance. They are similar in that they are both programs.

3-The structure of a relational database is based on the relational model―a mathematical model that combines data in tables.
4-Query is finding records that match specific criteria, they could help questions about anything because they are like a text searching device.
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Advantages:privacy
Disadvantages:too costly