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Polyester is a type of polymer that contains an ester functional group in its main chain. There are many different types of polyesters, but the term "polyester" usually refers to polyethylene terephthalate（PET）. It is the abbreviation of a synthetic man-made polymer.

Polyester is known as the tofu of man-made fibers because of its many forms of appearance. It is a generic term for any fabric or textile, and polyester is one of the world's most popular textile fabrics and a source of material for a wide variety of clothing, used in many consumer and industrial applications.

Polyester can be divided into "saturated polyester" and "unsaturated polyester" two categories, usually by one or more kinds of polyacid (anhydride) and one or more kinds of polyol by polycondensation.