An artificial replacement of a body part. It may be an internal replacement such as an artificial joint or an external replacement such as an artificial limb. A prosthesis may be individually manufactured for each client, such as a limb prosthesis, or may be manufactured in large numbers but in different sizes, such as artificial hip joints. Prostheses of all types are lighter and more functional than their predecessors; the broad field of prosthetics has benefited from advances in materials, miniaturization, and computer-generated fabrication.