Polymer degradation refers to the process where polymers, large molecules made of repeating units, break down into smaller fragments. This can occur due to various factors, including exposure to heat, light, chemicals, or mechanical stress. Over time, these factors can weaken the polymer's structure, leading to a loss of its physical and chemical properties. There are different types of polymer degradation, such as thermal degradation, photo-degradation, and chemical degradation. Each type affects the polymer differently, influencing its durability and lifespan. Understanding polymer degradation is essential for improving material performance and developing more sustainable products.