If at first you don't succeed, try, try, again. Then quit. There's no use being a damn fool about it.
– W. C. Fields


Iteration is a feedback process that repeats n number of times. Iteration refers to the act of performing the calculation of a certain function and then picking the result, or output, as the starting value, or input, for the next calculation of the same function. The operation repeats on and on – even infinitely, despite Fields's comment!