A database management system (DBMS) is a software program used to create database
applications – data can be stored in and information can be retrieved from more than one table
at a time. A relational database is the most common type of computerized database. This type
of database relates data in various database tables by using a primary key (a filed in a table
that contains unique data that is unlikely to change and that is used to uniquely identify each
record in that table).