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Set-top box (STB) refers to the information equipment used to enhance or expand TV functions. Because people usually put it on TV, it is also called set-top box or set-top box. Digital TV set-top box is a conversion device that converts digital TV signals into analog signals, which can provide high-quality TV programs for TV users.

Digital set-top boxes can support almost all broadcast and interactive multimedia applications, including watching ordinary TV programs, digitally encrypted TV programs, on-demand multimedia programs and information, electronic program guide (EPG), sending and receiving emails, Internet browsing, online shopping, distance education and so on.

You can't watch digital TV without a set-top box. At present, the TV set used by users can only receive analog signals, but not digital signals. Therefore, it is necessary to install a digital set-top box to decode and restore the digital signals and convert them into audio-visual signals that can be received by existing TV sets, so that users can receive digital TV programs.