What is the difference among nil, NULL, Nil in Objective-C?

They are all zeros, the difference lies in their types

• NULL is a generic pointer value ((void*)0, to be specific). It points to 0×0.
• nil is an id. So its points to a non-existent objective-c object
• Nil is a non-existent objective-c class
• [NSNull null] is an object that's meant to stand in for nil in situations where nil isn't allowed. For example, you can't have a nil value in an NSArray. So if you need to represent a "nil", you can use [NSNull null]

Also there is no 'null' in the objective c its 'NULL' not 'null'. 'null' exist in Java or in C# not in Objective-C

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