Question

why database is required​

Answer 1

We need databases b/c they organize data in a manner which allows us to query data, sort data, and manipulate data in various ways. ... We need some way to collect, store, retrieve, sort, graph, and manipulate the data of the world. Databases allow us to do this.

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Answer 2

To make this information more useful, easy to access and protected we use database management systems.