Features of the modules

Hi all,
could you answer to these few questions to give me the possibility to develop further documentation on the present modules?
Maybe, everyone of you could expound me the module on which he works more. Thanks!

· What supplies the module?
· Can you list the elements of the module?
· Can you describe the main features of the module?
· Can you add some code lines in order to explain how the module can be used?