Why is it necessary to make the block synchronized while iteratiing

Why is it necessary to make the block synchronized while iteratiing thru Synchronization Wrappers?
here is the code sample for same:
Collection c = Collections.synchronizedCollection(myCollection);
synchronized(c) {
Iterator i = c.iterator(); // Must be in synchronized block!
while (i.hasNext())
foo(i.next());
}

If at the first place I am getting all the methods synchronized by calling
Collection c = Collections.synchronizedCollection(myCollection);
that means no two threads can enter the data structure of this collection, I am not getting how ConcurrentModificationException will be thrown while iterating thru this collection?
Can u please explain in a little depth?

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Why is it necessary to make the block synchronized while iteratiing

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