MMS
Definition:
MMS stands for Multimedia Messaging Service and is the technology that supports sending emails, videos, audio and pictures from one mobile phone to another. In other words, video messages are delivered using MMS.
Here's a word you may not know...
aspect ratio
The aspect ratio of an image or other object is simply its width divided by its height. Traditional standard definition pictures have a 4:3 aspect ratio, where 4 represents the width and 3 represents the height. High definition pictures have a 16:9 aspect ratio.