Describe what a relational database is and why relational databases are needed.

The relational database is basically used as the set of the table in which the data can be easily accessible without any re-organizing the table in the database.

In the structured query language (SQL), the relational database is used as the standard users and API (Application programming interface).

Relational database is basically needed to store the information or data in the form of tables. Due to the relational database, we can easily compare the data or information because the data are arranged in the form of columns.