A database management system is a software tool used to create and manage one or more databases, offering an easy way to create a database, update tables, retrieve information, and enhance data. A DBMS is where data is accessed, modified and locked to prevent conflicts. (google)In other words is a pool of data, that have been formatted in order to be able to stored in the DBMS, and are used to facilitate the operation of a company, an organization or a country.