Polyester fibers are synthetic fibers made from a polymer called polyethylene terephthalate (PET). They are widely used in textiles due to their durability, resistance to wrinkles, and quick-drying properties. Polyester can be blended with other fibers, enhancing the performance and feel of fabrics. These fibers are commonly found in clothing, upholstery, and various household items. Polyester is also recyclable, making it a more sustainable option compared to some other synthetic materials. Its versatility allows it to be used in a range of applications, from fashion to industrial products.