Support - the skeleton is the 'frame' which supports the body, allowing us to maintain our shape.
Attachment - muscles, tendons and ligaments attach to the surface of the bones.
Movement - skeletal muscles allow us to move around and these are attached to the skeleton by tendons. If it were not for the skeleton, movement would be much harder and would be very restricted.
Protection - the skeleton protects most of the vital organs. For example the skull protects the brain and the ribcage protects the lungs and the heart.
Blood cell production - blood cells are made inside bone marrow, which is found in bones of the skeleton.
Joints are the meeting point of bones. These restrict as well as facilitate movement of bones.
Fixed joint , movable joints , ball and socket joints , pivot joints, etc., are different types of joints.