At a high level, a humanoid robot is composed of a bunch of links (such as forearms and thighs) and joints (such as elbows and knees). A joint is connected to one or two links, and a force applied on your joints will bend your links correspondingly.
Instead of looking at a full humanoid robot, we’ll be restricting our attention to a single arm, since the dexterity they require makes them interesting to study.
Robot arms aren’t just for superheroes – they’re popular with a wide range of applications. You’ll find them on the surface of Mars, inside car manufacturing plants, and even on Amazon.com if you’re looking for a cheap DIY weekend project.
Ali's Researches 