An Oracle database(RDBMS database) is an organiszed collection of data . The data can be text, pictures, programs anything that can stored in binary format in a computer.The purpose of a database is to store and retrieve related information. Data can accessed concurrently by multiple users with maintaining high performance.

The database has logical structures and physical structures. Because the physical and logical structures are separate, the physical storage of data can be managed without affecting the access to logical storage structures.

A relational database stores the data in the form of tables and columns. A table is the category of data, like Employee, and the columns are information about the category, like name or address.