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A Data Definition Language (DDL) is a computer language used to create and modify the structure of database objects in a database. These database objects include views, schemas, tables, indexes, etc.

This term is also known as data description language in some contexts, as it describes the fields and records in a database table.

Source: https://www.techopedia.com/definition/1175/data-definition-language-ddl#techopedia-explains-data-definition-language-ddl