Canon 35mm f2 IS USM is an Auto Focus (AF) Wideangle Prime 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 35mm. Providing a max aperture of f2 at 35mm, this lens is very fast.
This lens features on optical image stabilization which helps capturing sharper images at lower shutter speeds. Canon 35mm f2 IS USM is not a weather sealed lens, so you have to be extra careful against rain and dust.