What is the chitinous exoskeleton?

The chitinous exoskeleton is a hard, protective outer covering found in arthropods, such as insects, crustaceans, and arachnids. Composed primarily of chitin, a long-chain polymer of N-acetylglucosamine, this structure provides support, protection from predators, and helps prevent water loss. The exoskeleton must be periodically shed and renewed through a process called molting, allowing for growth. Additionally, it serves as an attachment site for muscles, facilitating movement.