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).