Polycaprolactone (PCL) is a biodegradable polyester made from the polymerization of ε-caprolactone. It is known for its flexibility, low melting point, and ability to degrade in the environment, making it useful in various applications, including medical devices and packaging materials. PCL is often used in 3D printing and as a material for creating scaffolds in tissue engineering due to its biocompatibility. Its slow degradation rate allows for sustained release of drugs, making it valuable in pharmaceutical applications.