Cable TV systems impose a monthly fee depending on the number and perceived quality of the channels offered. Cable TV subscribers are offered various packages of channels one can subscribe to. The cost of each package depends on the type of channels offered (basic vs. premium) and the quantity. These fees cover the fees paid to individual cable channels for the right to carry their programming, as well as the cost of operating and maintaining the cable TV system so that their signals can reach subscribers homes. Additional fees and taxes are often tacked on by local, state, and federal governments.