Polyester is a category of polymers that contain the ester functional group in their main chain.
As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET).
Polyesters include naturally occurring chemicals, such as in the cutin of plant cuticles, as well as synthetics such as polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not.
The material is used extensively in clothing.