A decoder is an electronic device or software that converts encoded data back into its original format. It is commonly used in various applications, such as telecommunications, data transmission, and multimedia systems. For example, a video decoder takes compressed video files and translates them into a format that can be displayed on a screen. In digital communication, decoders play a crucial role in interpreting signals. They can be found in devices like television sets, DVD players, and smartphones, where they help decode audio and video streams. By ensuring that the information is accurately retrieved, decoders enable users to access content seamlessly.