What is the Iterable interface used for?

Question

I am a beginner and I cannot understand the real effect of the Iterable interface.

Answer 1

It returns an java.util.Iterator. It is mainly used to be able to use the implementing type in the enhanced for loop

List list = ...
for (Item i:list) {
 // use i
}

Under the hood the compiler calls the list.iterator() and iterates it giving you the i inside the for loop.