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Data Types is useful in programming language to instruct compiler that which kind of value can be contained in the variable. Weather it can be integer, floating point or character.
Each type of value required different amount of memory space. Thus data types also instruct compiler to allocate appropriate amount of memory to hold the value of particular variable.
Following are the various categories of Primary Data Types of C Language.

Following are the various categories of Primary Data Types of C Language.
(1) Integer Data Type:
This category of data type represents numeric value without any decimal point. It is used to represent whole number.
In this category we can also specify type modifier along with data type. Type modifier allows us to increase or decrease the range of value that can be stored. In C language we can use short and long type modifier.

We can also use type modifier to represents number as a positive or negative. By default each data type is signed, means they can hold positive as well as negative numbers. In C Language we can use signed and unsigned type modifier.
Following are the Data Types contained in this category:

(2) Floating Point data Type:
This category of data type represents number with decimal point.
Following are the Data Types contained in this category:

(3) Character Data Type:
This category of data type represents single character.
Following are the Data Types contained in this category:

(4) Void Data Type:
This category of data type represents blank (null) value.
So it is not used to declare any variable. It is used to represent return type for the function that does not return any value.