DBMS (DataBase Management System)
A database management system (DBMS) is a computer software application that interacts with the user other applications and the database itself to capture and analyze data. A general-purpose DBMS is designed to allow the definition creation querying update and administration of databases.

These days databases are everywhere so every software developer needs to know the basics of DBMS

A database is an organized collection of data.It is the collection of schemas tables queries reports views and other objects. The data are typically organized to model aspects of reality in a way that supports processes requiring information such as modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies.

A database management system (DBMS) is a computer software application that interacts with the user other applications and the database itself to capture and analyze data. A general-purpose DBMS is designed to allow the definition creation querying update and administration of databases. Well-known DBMSs include MySQL PostgreSQL MongoDB MariaDB Microsoft SQL Server Oracle Sybase SAP HANA MemSQL SQLite and IBM DB2. A database is not generally portable across different DBMSs but different DBMS can interoperate by using standards such as SQL and ODBC or JDBC to allow a single application to work with more than one DBMS. Database management systems are often classified according to the database model that they support; the most popular database systems since the 1980s have all supported the relational model as represented by the SQL language. Sometimes a DBMS is loosely referred to as a "database".