These are two aliases:

"pdb" alias to Gimp.getpdb()

"gimp" alias to Gimp

The things on the right are GObjects, i.e. classes in
The alias has methods (and Python special methods)  that call the methods of the right side.

You could also say the aliases "wrap" or "adapt" the GObject classes.
There are more adapters in the /adapers directory.
