This is the proprietary format Apple uses for Quicktime, the built-in media player that comes with nearly all iterations of MacOS.
Much like MPEG-2 files, however, the MOV format never achieved widespread usage, rendering it a pain to use for users who opt for an operating system or device that doesn’t fall under Apple’s umbrella.
If you watch or edit your videos on a Mac, you can probably stick with using MOV files, but if you’re looking for a format with greater support, you’ll likely want to convert them MP4.
Here’s how to do so, using both desktop and web-based tools.
If the program isn’t already housed in your dock, click the Finder icon, select Applications in the left-hand pane, and select the program from the resulting list.
Once open, click the File menu in the application toolbar and select New Movie from the drop-down menu.