[trooper]

Originally posted by smitty:
Other than moving population around, what is the purpose of transports?

Also, is there a type of ship you can build that can travel with a fleet to keep the fleet supplied?

Troop transport are their main use.
I also have the habit to build specialized transports, like mine layers or satellite layers.
In the early game, the ship size "small transport" is quite usefull. It also costs too times less than a destroyer, which has the same tonnage.