Relational database is a type of database in which the data is stored in multiple tables, and these tables are interconnected.
Relation is a link between tables. The basic relation is 1:1 or 1: N or M:N.
Relational database in practice: Relational database is currently the most widely used type of database. SQL (Structured Query Language) has been gradually established for manipulating data in a relational database as a standard language. The main reason for the success of relational databases is the ability to query into the database, or over data to create a variety of summaries and reports across related tables.