DDL vs DML in SQL Server

DDL
Data Definition Language (DDL) statements are used to define the database structure or schema. Examples:

• CREATE - to create objects in the database
• ALTER - alters the structure of the database
• DROP - delete objects from the database

DML
Data Manipulation Language (DML) statements are used for managing data within schema objects. Examples:

• SELECT - retrieve data
• INSERT - add data
• UPDATE - modify data
• DELETE - remove data

Note : This is not limited to SQL Server