Polyesters are a type of synthetic polymer made from the reaction of alcohol and acid. They are widely used in textiles, packaging, and plastic products due to their durability, resistance to wrinkles, and ability to retain shape. Common examples include polyethylene terephthalate (PET), which is often used in clothing and plastic bottles. These materials can be produced in various forms, including fibers, films, and resins. Polyesters are also recyclable, making them a more sustainable option compared to some other plastics. Their versatility and strength make them a popular choice in many industries, including fashion and automotive.