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A turntable is also referred to as a phonograph or record player. It is a device used to play sound recordings on gramophone records, which consist of a circular piece of plastic or shellac, typically in black, though they can also be red, blue, green, yellow, and purple, with a spiral groove cut into it. The turntable has a rotating platter that holds the record, and a needle attached to a tonearm, which slides along the groove and reads the recorded data, creating an electric signal that is then sent to an amplifier and a loudspeaker. The phonograph was invented by Thomas Edison in 1877. It was the first device that could record and reproduce sound.