DML stands for Data Manipulation Language, which is a subset of operations used to insert, delete, and update data in a database. It is a collection of programming languages explicitly used to make changes to the database. DML is often a sublanguage of a more extensive language like SQL, and it comprises some of the operators in the language. Selecting read-only data is closely related and is sometimes also considered a component of a DML, as some users can perform both read and write selection.

DML commands are used to manipulate data in a database. The examples of DML in the Database Management System (DBMS) are SELECT, INSERT, UPDATE, and DELETE. The SELECT command is used to retrieve data from the database, while the INSERT command is used to insert data into a table. The UPDATE command is used to update existing data within a table, and the DELETE command is used to delete records from a database table.

DML has two main classifications, which are procedural and non-procedural programming, also called declarative programming. The SQL dealing with the manipulation of data present in the database belongs to the DML or Data Manipulation Language, including most of the SQL statements. Any adjustment made by the DML statement must be controlled by TCL statements (Transaction Control Language).

In summary, DML is a subset of SQL statements that alter the information stored in tables. It mainly concentrates on database performance and utilizes HDFS (Hadoop Distributed File System) storages append-only nature.