Telecommunication involves the electronic transmission of information such as digital data, video, and audio. It uses components like computers, terminals, communication processors, and software. Signals can be analog, containing continuous waveforms, or digital, containing discrete binary codes. Modems translate between digital and analog signals for transmission through wired mediums like phone lines or wireless mediums like cellular networks. Communication is managed by front-end processors, controllers, and multiplexers using network topologies like star, bus or ring configurations. Local and wide area networks transmit data over short or long distances using various cable, satellite, and wireless technologies. Electronic commerce relies on technologies like email, groupware, and videoconferencing to conduct business electronically.