A simple explanation of modules is that they are groups of functions. An example is the ezp content module which includes several functions for managing objects and nodes. Another example is the shop module which handles the basket and order process.
To learn more about modules, I recommend studying the modules that come with ezp (kernel/module_name). You can also check out the following tutorial for instructions on how to create your own module.
I tried using the media 'module' (It seems to be a module...) but I cant... a collegue of mine tried as well, but it just doesnt work. OR I(we) still dont use modules correctly.
ok... media is a section but what is the media tab for?
And why can I assign the media section a ~'navigation part' and assign it new classes? What impact does that have?
I belive the purpose of the Media section is to present media related objects like images and the likes in a format better suited for these objects (image library style). I've had no use for it so far, though, so I can't say for sure.