“the design of products and environments to be usable by all people, to the greatest extent possible, without the need for adaptation or specialized design”
These videos highlight descriptions of universal design. The first is Dr. David Rose from CAST, the second comes from Colorado State University, and the third from the University of Washington's Disability, Opportunity, Internetworking, and Technology (DO-IT).
UDL from David Rose
UDI from DO-IT