A parka or anorak is a type of coat with a hood, often lined with fur or faux fur. The hood protects the face from freezing temperatures and wind. The Caribou Inuit invented this kind of garment, originally made from caribou or seal skin, for hunting and kayakingin the frigid Arctic. Some Inuit anoraks require regular coating with fish oil to retain their water resistance.
The words anorak and parka have been used interchangeably, but they are somewhat different garments. Strictly speaking, an anorak is a waterproof, hooded, pull-over jacket without a front opening, and sometimes drawstrings at the waist and cuffs, and a parka is a knee-length cold-weather coat, typically stuffed with down or very warm synthetic fiber, and with a fur-lined hood.
credit and source: WIKIPEDIA
