You might think that bones are glued or sewn together but in reality bones are held together by magical holders called joints. Right now take a look at your shoulder or your finger or you elbow.  These are some parts of the body that help you out a lot, but you don’t really know how they work, so we’re going to explain it. One thing that all these parts of your body have in common is that they are mostly just a joint. These joints are all different from each other. There are actually five main types of joints. The ball and socket, Condyloid joint, Saddle joint, hinge joint, pivot joint. The ball and socket joint is made to almost move on a 360 degree angle. There are a lot of ligaments because of how much movement it can do but since there are so many ligaments a lot of things can go on. The ball and socket joint structure is good because when protecting or blocking yourself human instincts are to cover yourself with your arms using your ball and socket joint. You have to move your arms in many directions so the ball and socket joint is very useful.A good example of the condolid is the wrist bone. The condyloid is what gives the wrist bone flexibility to move in different ways. But it doesn’t get all of the flexibility that the ball and socket gets. Saddle joint, You can find this joint in your thumb. The thumb sits on a kind of bone that sits on another bone. The saddle joint is also what gives your thumb to move in different ways, like how you can touch all your fingers on your hand with only your thumb. Hinge joint, You will find this joint in your fingers. This joint only moves one way. It is just like door. It only moves forward. Our human body has adapted to picking up things so now our hands only need to one way, but who know what we would be capable of if we could move our joints backward. Where would your nails be. Our life would be very different if our fingers were more like the ball and socket joint. The animals before were digging so this joint was an advantage. It would make your joints stronger.he pivot joint you find in your elbow and that makes you rotate your elbow in different ways. This joint looks like a pole that has a semi circle wrapped around the top. Now that you know more about your joints, hopefully you will be more careful about cracking your knuckles or popping out a joint.