1. Digital Video File Formats
.AVI - commonly found in digital cameras.
.MOV - Quicktime - Apple file format
.WMV - Windows Media File usually made in MovieMaker
.DV - Native Raw format from a DV camera (cross platform)
.REAL - Real Video file format.
MPEG - Various types of video compression
FLV - Flash Video, commonly found online

2. Digital Audio File Formats
.WAV - wave files, low quality
.MP3 - compressed, medium quality file format (cross platform)
.MP4 - mainly used by iTunes
AIFF - native file format on CDs, very high quality, very large files (cross platform)
WMA - Windows Media Audio file

3. Digital Photo File Formats
.GIF - web file format, low quality, high speed (common)
.JPG - easily compressed, medium quality (common)
.PNG - new file format seen on the web for photography, it has lossless compression
.TIF - professional file format, high quality, scalable (common)
.EPS - pro image, very scalable, large files
.RAW - ultra high quality format, very flexible, giant file formats