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A television system consists of elements that are essential for the use of this technology. One of the main elements of a simple television system is an image source. This can be a camera for live pick-up of images or a Film-Chain-Telecine-flying spot scanner for the transmission of films. Another element of a television system is a sound source. A transmitter is also an element of this system and it modulates one or more television signals with both picture and sound information for transmission. A receiver also belongs to a television system and it recovers the picture and sound signals from the television broadcast. Other elements of the television system are a display device that turns the electrical signals into visible light and a sound device that turns electrical signals into sound waves to go along with the picture.

Modern and practical television systems also include equipment for selecting different image sources, mixing images from several sources at once, for the insertion of pre-recorded video signals, for synchronizing signals from many sources and a direct image generation by computer for purposes such as station identification.
Originally the transmission occurred over the air by using land-based transmitters though the quality of reception varies greatly. This led to the proliferation of large antennas on house roofs to receive the best signal. Today most cities use cable systems to deliver television over metal or optical cables. Television can also be delivered by radio from synchronous satellites. Today most households can choose between different forms of television they receive. They have the choice of receiving analog or HDTV over the air, analog or digital cable with HDTV from a cable television company or even from a phone company that both use different types of cables.