1. A database-management system (DBMS) is a collection of interrelated data and a set of programs to access those data.
2. This is a collection of related data with an implicit meaning and hence is a database that contains information relevant to an enterprise.
3. The primary goal of a DBMS is to provide a way to store and retrieve database information that is both convenient and efficient

A datum – a unit of data – is a symbol or a set of symbols which is used to represent something.

 Knowledge refers to the practical use of information.