Audio Video Interleaved � An AVI file is a sound and motion picture file that conforms to the Microsoft Windows Resource Interchange File Format (RIFF) specification. avi file extension

Short for compressor / decompressor, a codec is any technology for compressing and decompressing data. Codecs can be implemented in software, hardware, or a combination of both. Some popular codecs for computer video include MPEG, Indeo, Cinepak, DivX and Xvid. full codecs list

EXchangeable Image File format - Basically, Exif file format is the same as JPEG file format. Exif inserts some of image/digicam information data and thumbnail image to JPEG in conformity to JPEG specification. Therefore you can view Exif format image files by JPEG compliant Internet browser/Picture viewer/Photo retouch software etc. as a usual JPEG image files. Tiff files can have the same Exif data. exif tags list

Joint Photographic Experts Group - A lossy compression scheme designed for still images. Excellent for continuous-tone images such as photographs. jpg file extension

Moving Picture Experts Group - A standard for compressing moving pictures. MPEG uses the similarity between frames to create a sequence of I, B, and P frames. Only the I frame contains all the picture data. The B and P frames only contain information relating to changes since the last I frame. mpg file extension