Q: What is Universal Design for Learning?

A: Universal Design for Learning is a set of principles for curriculum development that give all individuals equal opportunities to learn.

UDL provides a blueprint for creating instructional goals, methods, materials, and assessments that work for everyone--not a single, one-size-fits-all solution but rather flexible approaches that can be customized and adjusted for individual needs.
http://cast.org/udl/index.html 
http://www.udlcenter.org/aboutudl/udlguidelines