exif is the shooting details of each shot, they are usually embedded in the image when you import it from your camera/card. Sometimes the EXIF is tossed out when the image is compressed down the point where it can be posted here.
At the very minimum the exif required would be Shutter speed, Aperture, ISO setting and focal length of each individual shot you post. However more detailed exif would show other useful items like these
-metering method
-flash used/not
-camera mode (av, tv, m, p, auto)
-lens description
-colour space
-white balance (kelvin temp)
-picture control settings
etc.
Whatever you use to import the images you can usually get the exif by right click the image and select properties.
Good Luck!
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