Human skeleton models are primarily used for education and demonstration, particularly in healthcare and educational settings, to illustrate bone structure, movement, and various medical conditions. They also play a role in design and engineering, as well as research and analysis of human skeletal remains. 

The human skeleton serves six main functions: support, movement, protection, blood cell production, storage of minerals, and endocrine regulation. It provides a rigid framework for the body, allowing for movement and protection of vital organs.