the patterns used in iterators

I am familiar with the usage of C++ STL iterators, e.g. for(map>::iterator it=m.begin(); it!=m.end(); ++it) int a = it->first; int b = it->second; But I don't know the inner details in it. Could some explain to me? Either in C++, Java, C# or Python.
Iterator concepts differ in C++ and Java/C#. In both cases they are incrementable and dereferenceable objects, but the set of operations and the usage differ.

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