Polycaprolactone (PCL) is a biodegradable polyester that is commonly used in various applications, including 3D printing, drug delivery, and tissue engineering. It is known for its flexibility, low melting point, and ability to degrade in the environment, making it a popular choice for sustainable materials. PCL is synthesized through the ring-opening polymerization of ε-caprolactone, a cyclic ester. Its properties allow it to be processed easily, and it can be blended with other polymers to enhance performance. Due to its biocompatibility, PCL is often used in medical applications, such as sutures and scaffolds for cell growth.