sql means structured query language,it is a means(language) through which we can interact the physical database, as we can create a database or we can do some manupulations or we can control the operations of what we are planning to it.so based on the above operaqtions of what I have mentioned here can be done with the help of universaly accepted language called SQL and where this can be categorized into DDL and DML.i.e (DATA DEFINITION LANGUAGE AND DATA MANUPULATION LANGUAGE) and for this some set of statements are been used for eg: for DDL we use "create" for DML we use "insert/update/delete/merge".....