Why is database useful?

A database is a program that stores information. Such info can be sorted and retrieved in whatever output the operator requires. A common use for a database is to store the names and addresses of members belonging to a club, etc. The club Secretary or Treasurer can sort the membership database to show those member who have not yet renewed their membership subscription.

A commercial company may have a database showing customers' names, addresses and other details, their past purchases, their credit state, and so on.