A transcoder is a software or hardware tool that converts media files from one format to another. This process is essential for ensuring compatibility across different devices and platforms, such as converting a video file from MP4 to AVI or an audio file from WAV to MP3. Transcoding can also involve changing the resolution or bitrate of a file to optimize it for streaming or storage. Transcoders are commonly used in various applications, including video editing, streaming services, and digital media management. They help maintain the quality of the original content while making it accessible for different users and devices. Popular transcoding software includes HandBrake and FFmpeg.