Meaning of the terms Change Control and Document Control?

Hello everybody!

Could you give me some more information about the terms ''change control'' and ''document control''?? I have searched their meaning in the internet but it is not so clear to me. An example of these terms in the food industry would also be helpful.

Thanks!

Regards,

Giannis 

This will probably be helpful.

Marshall

Yes, it was really helpful. 

Thanks a lot Marshall!

Giannis