How many types of transport requests? Explain?

There are 3 types of requests:
K type:
The transport K type implements transports of DE objects from the integration system into the consolidation system. When you create a transport request using the workbench organizer, it always uses this transport type by default meaning that all the transportable change requests stored in the workbench organizer are allocate this transport type. For this transport type, the objects are transported to the consolidated systems without changing the object’s system owner which means that the transported objects in the consolidated system become repair objects and no corrections are allowed for the imported objects.
C type:
With this transport type the objects change the system owner after they are transported which means that the source system of the object loses its ownership after the object is transported. So the target system in which the objects are transported becomes the original system. In other words objects are transported as original objects. So they can be corrected or modified in the target system too. That means that change authorization is also transported. In SAP terms, objects that are transported with C types are checked out of a system and checked into another system.
T type:
This transport type is useful when you have to copy object between two systems in a group ie when a system(other than consolidation system) receives a copy of objects, the corresponding transport takes place with transport type T. Object including the object of transport type T do not change their system owner. So the original system remains same.