DBMS stands for Database Management System. It is a software system designed to manage and organize large collections of data stored in a database.

A DBMS provides an interface for users to interact with the database, allowing them to retrieve, update, and store data. It also provides tools for administrators to manage the database and ensure its security, reliability, and performance.

There are several types of DBMS, including:

  1. Relational DBMS (RDBMS): stores data in the form of tables with rows and columns, and uses SQL (Structured Query Language) to interact with the data.
  2. Object-Oriented DBMS (OODBMS): stores data in the form of objects and uses object-oriented programming languages to interact with the data.
  3. NoSQL DBMS: stores data in a variety of formats, including key-value pairs, document-based, and graph databases, and uses a variety of query languages and APIs to interact with the data.

Examples of popular DBMS include Oracle Database, Microsoft SQL Server, MySQL, MongoDB, and Cassandra.