A database is an organized collection of data, stored and retrieved digitally from a remote or local computer system.
DBMS (Database Management System) is a system software responsible for creating, retrieving, updating, and managing databases.
RDBMS (Relational Database Management System) stores data in tables and allows relations between tables through common fields.
SQL (Structured Query Language) is the standard language for relational database management systems, used for handling organized data and managing entities.