Canon 55-200mm f4.5-5.6 II USM is an Auto Focus (AF) Telephoto Zoom lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 55 - 200mm. With the max apertures of only f4.5 at 55mm, and f5.6 at 200mm, the lens is quite slow at both ends.
Canon 55-200mm f4.5-5.6 II USM is not a weather sealed lens, so you have to be extra careful against rain and dust.