A skeleton is a structural frame that supports an animal body.There are several different skeletal types: the exoskeleton, which is the stable outer shell of an organism, the endoskeleton, which forms the support structure inside the body, and the hydroskeleton, a flexible skeleton supported by fluid pressure.[clarification needed] The term comes from Ancient Greek σκελετός (skeletós) ‘dried up’.

https://en.wikipedia.org/wiki/Skeleton