Final answer:
SQL is a comprehensive language used in databases, incorporating DDL for defining structure, DML for data manipulation, and QL for data retrieval.
Step-by-step explanation:
SQL stands for Structured Query Language and is the standard language for dealing with relational databases. SQL encompasses a variety of functions including data definition, data manipulation, and query retrieval.
Data Definition Language (DDL) is a component of SQL that defines the database structure or schema. This includes creating, altering, and deleting tables and database schemas.
Data Manipulation Language (DML) is the set of SQL commands used to insert, update, delete, and retrieve data from the database. These commands are essential for maintaining and querying the data within the database.
Query Language (QL), often integrated within SQL, allows users to perform queries to retrieve specific data. It uses commands such as SELECT to fetch data based on certain criteria.