In short the mp4 format is the most supported across the internet. There are disadvantages, but the pros outweigh the cons. Mp4 makes it easy to share on YouTube, Instagram, Twitter, and even via text message. MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.