Sql is DBMS or RDBMS in SQL

Sql is RDBMS.

RDBMS is a database management system (DBMS) that is based on relational model as introduced by E.F.Code.

It is a DBMS in which the database is organized and accessed according to the relation between data.

In a relational database, relationships between two or more tables by primary and foreign key.

Example- SQL, Orcle, Mysql, Mysql server