Polyester resins are synthetic materials commonly used in the production of plastics and composites. They are created through a chemical reaction between alcohol and acids, resulting in a durable and versatile substance. These resins are often used in applications such as fiberglass, automotive parts, and marine products due to their strength and resistance to moisture. One of the key benefits of polyester resins is their ability to be molded into various shapes, making them ideal for creating complex designs. They can also be combined with other materials, like fiberglass, to enhance their properties, leading to lightweight yet strong products suitable for a wide range of industries.