Data Definition Language; defining database structures but not their contents.
DDL is Data Definition Language, which is a general term used to refer to commands, scripts, or functions that are used to create the structures, objects, and framework of a database.
This can include table definitions, indexes, constraints, foreign key relationships, views, stored procedures, and functions.
In the most general sense, DDL can be any statement that begins wither either
DDL is related to but different from dml, or Data Manipulation Language, which is used on the actual data within the database objects.