A skeleton is the internal framework of bones that supports the body of many living organisms, including humans. It provides structure, protects vital organs, and allows for movement by serving as attachment points for muscles. In humans, the skeleton consists of 206 bones at adulthood, which can be categorized into the axial skeleton (skull, spine, and rib cage) and the appendicular skeleton (limbs and pelvis). In addition to humans, many animals, such as dogs, cats, and birds, also have skeletons made of bones. Some creatures, like octopuses and jellyfish, have different structures, such as soft bodies or hydrostatic skeletons, which help them maintain shape and support movement. Skeletons can also be found in the fossil record, providing valuable information about the evolution of species.