A DBMS based on relational model is called relational database management system or RDBMS.
RDBMS uses relational structures to store data. A relation is also called a table.A relation contain tuples (rows) and attributes (columns).
STUDENT
| Roll_no | Name | City |
| 10001 | Anurag | Burhanpur |
| 10002 | Yash | Khandwa |
| 10003 | Praful | Nepa nagar |
| 10004 | Harshal | Khanknar |
MARKS
| Roll_no | Marks |
| 10001 | 92 |
| 10002 | 81 |
| 10003 | 78 |
| 10004 | 85 |
In RDBMS tables are related each other.
Relation are set using a common column between tables.
In above tables, Roll_no is a common attribute between them which established a relation.