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The void Type
The void type specifies that no value is available. It is used in three kinds of situations:

S.N. Types and Description

1 Function returns as void
There are various functions in C which do not return any value or you can say they
return void. A function with no return value has the return type as void. For example,
void exit (int status);

2 Function arguments as void
There are various functions in C which do not accept any parameter. A function
with no parameter can accept a void. For example, int rand(void);

3 Pointers to void
A pointer of type void * represents the address of an object, but not its type. For
example, a memory allocation function void *malloc(size_t size); returns a pointer to
void which can be casted to any data type.