A video transcoder is a software or hardware device that converts video files from one format to another. It is commonly used to convert videos into formats that are compatible with different devices or platforms. Transcoding involves decoding the original video file, making necessary modifications, and then encoding it into a new format. This process may include changing the video codec, resolution, bit rate, or container format. Video transcoders are essential for media professionals, content creators, and anyone who needs to optimize video files for specific requirements. They play a crucial role in ensuring seamless video playback and compatibility across various devices and platforms.