Generator-Function: A generator-function is defined like a normal function, but whenever it needs to generate a value, it does so with the yield keyword rather than return. The yield statement suspends the function’s execution and sends a value back to the caller, but retains enough state to enable the function to resume where it is left off. When resumed, the function continues execution immediately after the last yield run.

Generator-Object: Generator functions return a generator object. Generator objects are used either by calling the next method on the generator object or using the generator object in a “for of” loop (as shown in the above program) The Generator object is returned by a generating function and it conforms to both the iterable protocol and the iterator protocol.