Data Definition Language (DDL) is a standard for commands that define the different structures in a database. DDL statements create, modify, and remove database objects such as tables, indexes, and users. Common DDL statements are CREATE, ALTER, and DROP.
What are DDL and DML?
What are DDL and DML and their commands?(SearchOracle.com)
What is the difference between data definition language (DDL) and SQL?
Learn the difference between a data definition ...(SearchDataManagement.com)
Mark Whitehorn explains the difference between data definition language (DDL) and data manipulation language (DML).