Wax paper is a type of paper coated with a thin layer of wax, usually paraffin, on both sides. This makes it moisture-resistant and non-stick, making it ideal for wrapping food, storing items, and lining baking trays for tasks like rolling dough. However, it is not heat-resistant, so it should not be used in the oven as it can melt or ignite. Wax paper is commonly used in kitchens for food preparation and preservation due to its practicality and convenience.