Data Definition Language (DDL) is a standard for commands which defines the different structures in a database. Most commonly DDL statements are CREATE, ALTER, and DROP. These commands are used for updating data into the database.

DDL, or Data Definition Language, is a set of commands used to define and manage the structure of a database and its objects. These commands enable users to create, modify, and delete database objects such as tables, indexes, views, and schemas. Examples of DDL commands include CREATE, ALTER, DROP, and TRUNCATE. In essence, DDL is concerned with specifying the database schema and its organization.