EXIF

The Exchangeable Image File (EXIF) format is used by nearly all digital cameras that output images as JPEGs. It enables information, such as date and time the shot was taken, plus exposure and other camera information, to be stored in the image file alongside the normal image information. These details can then be read by photo archiving software such as Piccolo, so you can get an instant view of exactly what your camera was doing when you took the shot, which is handy for trouble shooting and retaking.