What is Data Type In C

In the C Programming Language, Data Types refers to an extensive system for declaring variable of different types. 
A data types tells the following things about the related variable:

• What is the size of the variable?
• How much its occupies space in storage?
• How the  variable bit mapped for its operation?

All data types used in C programming, generally defined in standard library header files. In header files, all the characteristic such as size, space etc. of data-types has been defined.

If you want, you can create your own custom data types in C.