What is NULL pointer?

What is NULL pointer?

A null pointer does not point to any object.

NULL and 0 are interchangeable in pointer contexts.Usage of NULL should be considered a gentle reminder that a pointer is involved.
It is only in pointer contexts that NULL and 0 are equivalent. NULL should not be used when another kind of 0 is required.

A pointer that points to a no valid location is known as null pointer. Null pointers are useful to indicate special cases. For example, no next node pointer in case of a linked list. An indication of errors that pointers returned from functions.
Difference between Function to pointer and pointer to function
A pointer to a function is a pointer that points to a function. A function pointer is a pointer that either has an indeterminate value, or has a null pointer value, or points to a function
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