Why A what is a hard skeleton on the outside of some animals that gives structure for protection?

A hard skeleton on the outside of some animals, known as an exoskeleton, serves multiple purposes. It provides structural support, allowing the animal to maintain its shape and protect its internal organs. Additionally, the exoskeleton acts as a barrier against predators and environmental hazards, while also preventing water loss in terrestrial environments. Examples of animals with exoskeletons include insects, crustaceans, and arachnids.