A relational database management system (RDBMS) is a collection of programs and capabilities that enable IT teams and others to create, update, administer and otherwise interact with a relational database. Most commercial RDBMSes use Structured Query Language (SQL) to access the database, although SQL was invented after the initial development of the relational model and is not necessary for its use.
SQL is important because of the following main reasons -
a. SQL helps you to find the needed information or data easily.
b. SQL is a query language, not a programming language. You can easily write commands almost same as you write English.
c. It quickly stores and gets data from the database quickly. SQL is used for the query, insert, collect and manages data from the database.
d. Almost every database system will need SQL for further processing.