Answer Posted / ankit

DDL (Data Definition Language) refers to the CREATE,
ALTER and DROP statements

DDL allows to add / modify / delete the logical structures
which contain the data or which allow users to access /
mantain the data (databases, tables, keys, views...). DDL is
about "metadata".

DML (Data Manipulation Language) refers to the INSERT,
UPDATE and DELETE statements

DML allows to add / modify / delete data itself.

DQL (Data Query Language) refers to the SELECT, SHOW and
HELP statements (queries)

SELECT is the main DQL instruction. It retrieves data you
need. SHOW retrieves infos about the metadata. HELP... is
for people who need help.

DCL (Data Control Language) refers to the GRANT and
REVOKE statements

DCL is used to grant / revoke permissions on databases and
their contents. DCL is simple, but MySQL's permissions are
rather complex. DCL is about security.

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