Hi,
The basic types are WorkBench request and Customization request.
Apart from these we also have something called Trasport of copies and Relocations.
Trasport of copies is used to collect request into one request like copying the object list of each request and then you can ask your basis guy to transport them to a different system not in sytem landscape.
There are three types of relocations
Relocations without package change
Relocations with package change
Relocations of complete packages
Regards,
Sesh
