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Depends on who you ask and the context of the question, the answer is probably in your book or notes.
It is the additive identity of most sets of "ordinary" numbers. Division by zero is not defined.
It demonstrates that 1 is the identity element, in some set, for the operation defined by x.
The zero identity is defined in the context of a binary operation defined by addition over a set. It states that there is an element in the set, denoted by 0, such that for every element, X, in the set, 0 + X = X = X + 0. Addition in the set need not be commutative, but addition of 0 must be.
If a set, with multiplication defined over its elements has the identity property it means that there is a unique element in the set, usually denoted by i, such that for every element x in the set, x*i = x = i*x.If the elements of the set are numbers then i = 1.