In photography, a lens hood is mounted to the end of a lens to block the sun or other light source in order to prevent glare and lens flare which make your pictures look dull and unflattering.
Lens hood also helps to protect the front of the lens from scratches.
Please select the correct lens hood model for your lens as detailed below:
For Nikon:
HB-32 Lens Hood - Nikon 18-70mm, Nikon 18-105mm, Nikon 18-135mm and Nikon 18-140mm Lenses
HB-35 Lens Hood - Nikon 18-200mm AF-S Lens