SQL is a standard programming language used to manage and manipulate relational databases (RDBMS). Relational databases store data in a highly structured, tabular format. eg - MySQL, PostgreSQL, Oracle, SQL Server, IBM Db2. NOSQL - NoSQL is a broad category of databases that do not adhere to the traditional relational model. The term "NoSQL" often means "Not only SQL, Core architecture is non-relational. NoSQL databases are designed to handle large volumes of diverse data, including unstructured and semi-structured data, and to scale horizontally