GTK is essentially an object oriented application programmers interface (API). Although written completely in C, it is implemented using the idea of classes and callback functions (pointers to functions). There is also a third component called GLib
PyGTK 2.0 is a set of Python modules which provide a Python interface to GTK+ 2.X. Throughout the rest of this document PyGTK refers to the 2.X version of PyGTK and GTK and GTK+ refer to the 2.X version of GTK+
