Digital Command Control (DCC) is a system used in model railroading that allows for precise control of multiple trains on the same track. Unlike traditional systems that use analog signals, DCC sends digital commands through the track, enabling each locomotive to operate independently. This means that you can control speed, direction, and lighting features of each train individually. DCC systems typically consist of a command station, decoders installed in locomotives, and a power supply. The command station sends digital signals to the decoders, which interpret the commands and adjust the train's functions accordingly. This technology enhances the realism and flexibility of model train operations.