When working on applications in any programming language, you might have encountered null exceptions or null reference exceptions. A null pointer or a null reference is one that does not refer to a valid memory location or object. It is a problem that has plagued programmers as long as programmers have been writing programs.
A null value is a special value that denotes non-availability of a valid value. A null value is one that, when assigned to an object, resets the value of a field or a variable in the object to no value, i.e. an empty value.
