it is like why we call zero a number even it has nothing in it.
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a set which has no elements in it is called a null set. example - A={}.
Null Set is also called Void Set. Some books have even called it Empty Set.
An empty set in math is called a null set.
The null set. Every set is a subset of itself and so the null set is a subset of the null set.
A null set is a set with nothing in it. A set containing a null set is still containing a "null set". Therefore it is right to say that the null set is not the same as a set containing only the null set.