Why is the x power of y = a, in which a must be greater than 0 and not equal to 1

Why is the x power of y = a, in which a must be greater than 0 and not equal to 1

This is an exponential function, and what we require is that the domain of definition belongs to the whole set of real numbers. Therefore, our base a should be greater than zero and not equal to one. If it is equal to one, it is meaningless for us to list this formula. If it is less than zero, it is a negative number, and our negative number has no negative exponential power, so the base of an exponential function should be greater than zero and not equal to one