Canon 10-18mm f4.5-5.6 IS STM is an Auto Focus (AF) Wideangle Zoom lens with APS-C / DX max sensor coverage. When mounted on a APS-C / DX sensor camera, it will give you an FF equivalent focal range of 15 - 27mm. With the max apertures of only f4.5 at 10mm, and f5.6 at 18mm, the lens is quite slow at both ends.
This lens features on optical image stabilization which helps capturing sharper images at lower shutter speeds. Canon 10-18mm f4.5-5.6 IS STM is not a weather sealed lens, so you have to be extra careful against rain and dust.