DOCSP-23438-DDL-glossary-entry (#1373) (#1391)

Co-authored-by: jason-price-mongodb <[email protected]>

Co-authored-by: jason-price-mongodb <[email protected]>

Author: jason-price-mongodb

source/reference/glossary.txt

@@ -279,6 +279,13 @@ Glossary
       The location of MongoDB's data file storage. See
       :setting:`~storage.dbPath`.
 
+   DDL (Data Definition Language)
+      DDL includes commands that create and modify collections and
+      indexes. For the full list of commands, see
+      :ref:`transactions-operations-ddl-explicit`,
+      :ref:`transactions-operations-ddl-implicit`, and
+      :ref:`txn-prod-considerations-ddl`.
+
    delayed member
       A :term:`replica set` member that cannot become primary and
       applies operations at a specified delay. The delay is useful for