Polyesters are a category of synthetic polymers made from ester functional groups. They are commonly used in textiles, packaging, and plastic products due to their durability and resistance to wrinkles and shrinking. The most well-known type of polyester is polyethylene terephthalate (PET), which is widely used in clothing and beverage bottles. These materials can be produced through various chemical processes, including condensation polymerization. Polyesters can be engineered to have different properties, making them suitable for a range of applications, from fabrics to automotive parts. Their versatility and strength make them a popular choice in many industries.