A database is a collection of data belonging to the same context, that is systematically stored for later use. In this sense, a library can be considered a database composed mostly of documents and texts printed on paper and indexed for reference. Currently, due to technological development in fields such as computer and electronics, most of the databases are in digital format (e), and therefore offers a wide range of solutions to the problem of storing data.
There are programs called data management systems databases, abbreviated DBMS that store and subsequently access data in a structured manner. The properties of these DBMS, and their use and management, are studied within the field of computing.
Common applications are for the management of companies and public institutions data. They are also widely used in scientific environments in order to store the experimental data.
Although databases may contain many types of data, some of them are protected by the laws of several countries. For example in Spain, personal data is protected by the Organic Law of Protection of Personal Data (LOPD).