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Steven Parker215,939 Points
A "forEach" isn't exactly a loop, it's an array method. So one difference is that you cannot use a "break" or "continue" in it.
But when you want to do something with every array element it can be handy, since it gets passed both the element and the index as arguments.
Another advantage is that it only acts on elements that have been assigned values, so it needs no special testing code when using it on "sparse" arrays.
For more details, see the reference page on MDN.