When is a database used?

Answer 1

A Database is a organized collection of inter-connected data items. It is a collection of persistent data (or information).

You need Database when you want to share data of all kinds between users, between tools working on them, between computers. Either it might be a different users or other applications, everyone can access the same set of Data.

We need a reliable storage system which can guarantee the health of Data.

Several users/applications must be able to safely access the same data concurrently.

You can use large amount of data efficiently.

there are many more reasons Security, protection, we can restrict the users to certain levels, etc.