Your fingers turn into a sticky black mess after using the stuff. This tape is made to protect wire, cable and hoses from being rubbed through. It provides some extra strength and support for the final few inches of wire that are dangling in the air where it is attached to some electrical component. It is often used to hold wire looms together, and as a security wrap over electrical tape that has been applied to cover bare wire. Finally, there is duct tape, the stuff of legend.
People write books and sing songs about the stuff.
Duct tape lacks the flexibility of friction tape, so it doesn't work as well for wrapping wire and doesn't conform as well to curved surfaces like water hoses. There is a lot of cheap duct tape on the market. Some of it barely sticks to itself, much less a weak radiator hose. Pay the extra money for the professional-strength stuff. If you have a hard time peeling it off the roll, that means the adhesive will truly stick in the field.