Video conversion is the process of changing a video file from one format to another. This is often necessary because different devices and platforms support various formats, such as MP4, AVI, or MOV. By converting a video, users can ensure compatibility with their desired playback device, whether it's a smartphone, computer, or streaming service. The conversion process typically involves using software or online tools that can decode the original video format and re-encode it into the target format. This allows for adjustments in quality, resolution, and file size, making it easier to share or store videos according to specific needs.