E.g. Hydra, Jellyfish do not have bones. Some animals like Squid and shark have no bones. They can be as long as 35 feet in body length. Squids have an endoskeleton, an internal supporting, strong structure of Calcium salts. It is hard and rigid.
Sharks have an endoskeleton of cartilage alone and have no bones though they are vertebrates.
We, adult humans, have 206 bones in our body. Nearly all parts of our body have them. The skull and face have 28, the adult backbone has 26 of them. The number of bones of the rib cage is 25. Each of our limbs has 30 bones.