When Avatar compresses your video, we prepare your program for display on a computer. We digitize your video and convert it to whatever computer file format you require. Since 'raw' video files are tremendously huge (often many gigabytes!) they must be compressed to useful, deliverable sizes. There are several popular file types for displaying video on computers, such as QuickTime, MPEG, and .avi. We will be happy to help you decide which format works best for you.