The document defines orthotics and prosthetics and describes common devices used for each. Orthotics are devices that support or immobilize parts of the body, like splints or braces, while prosthetics replace missing body parts like limbs. It provides details on various static and dynamic orthoses, including examples like knee braces or back supports. For prosthetics, it outlines the components of lower and upper limb prostheses and different suspension, joint, and terminal device options. The ideal orthosis or prosthesis is described as functional, fitting well, light weight, easy to use, acceptable cosmetically, and easily maintained or repaired.