A cable box is either a dark green, light green, or a silver box (found in the frontyard of a house that has cable television service) that connects the house to the cable service. The box can sometimes be found in alleys in apartment buildings, or telephone poles for houses, and was historically used to block or allow premium channels to be part of the customer's service plan.
A cable box is a type of set-top box which is provided by some cable television companies that gives the user of the cable television more channels than they would have without the cable box. These devices serve as a way to allow non-cable ready TVs to emulate cable-ready ones, or to allow analog TVs to view digital channels. Such devices also often include decryption hardware to allow access to premium channels.