A tarpaulin is a sizable waterproof sheet that comes in different sizes and is typically constructed of plastics like HDPE, LDPE, or PVC. Older versions of them were used to cover items on ships, hence the name "tarred canvas" (tar + palling). For different types of uses, there are several varieties of tarpaulins that are available in various materials and thicknesses, such as canvas, urethane-coated polyester, polyethylene, etc. Tarpaulins are now constructed from woven polyethylene, which lowers their cost.
These substantial sheets contain reinforced eyelets (grommets) or holes at regular intervals along the edges and corners that are used to thread nylon ropes through them so they can be fastened to an anchor. Tarpaulins are primarily used to protect buildings from rain and, in certain situations, even from sun and wind.
