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Overview
A database is a set of information associated with a specific topic (managing orders for example). This information is organized and stored in a database so that it can be easily accessed by the users.

The databases are part of our daily life: a simple address book is a database.

The address book enables you to store names, addresses, phone numbers, ... The alphabetical index allows you to retrieve people easily.

In a computerized database, we find the same concepts as in the address book:

  • the information stored corresponds to the items.
  • the groupings of information correspond to the data files,
  • the indexes are created from the sort items (called keys).