The most common file format for video, compatible with nearly all devices.

If you are trying to find a specific video or article associated with this exact file size, it may be a unique file from a content management system or personal link.

(or similar, depending on aspect ratio). It is low-definition and commonly used for fast streaming or small file sizes.

If you can provide the context of where you saw this, such as: A ? A message from a friend? A download site ?