If you live somewhere where it snows frequently, accumulated snow or freezing rain with below freezing temps will leave a layer of ice on your car's windows if not cleaned quickly. Sometimes, a brush and a car's defrosters running can be enough. But if it's cold enough or thick enough, a plastic scraper may be needed to get the job done.

If that's true - then I want to live where you are. A snow scraper is a little flimsy hand-held plastic shovel kind of thing that is supposed to be used to remove ice and snow from your windshield and other car windows. They're usually pretty flimsy and break easily.
Not very effective, but we usually have one or two in our car just in case we might need it.