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A TV (Television) is a device that displays moving images and sound, and is used for entertainment, news, educational, and promotional purposes. It usually receives signals through an antenna, cable, or satellite and displays them on a screen. TVs have evolved from black and white, to color, to high-definition (HD) and now to 4K Ultra HD. They come in various sizes and types, including CRT, LCD, LED, OLED, and plasma.