A digital converter box, also known as a set-top box, is a device that converts analog television signals into digital signals. This allows older televisions to receive and display digital broadcasts. Digital converter boxes were required in the United States for analog television broadcasts that ended in 2009.
Digital converter boxes offer several benefits over analog broadcasts. Digital signals are more resistant to interference and provide a clearer picture and sound. Digital broadcasts also offer more channels and interactive features, such as on-screen guides and closed captioning.