What is the use of the video plug-in of the player? Can you give an example?

All kinds of video files are encoded and compressed according to certain rules. Different formats of video files have different coding rules. When playing a video file, the player must first decode and restore the file, and then convert it into a computer-readable binary code for the graphics card or CPU to process. Different video formats require different video plug-ins. Video plug-ins are also equivalent to decoders.