OERs are teaching, learning and research resources that reside in the public domain or have been released under an intellectual property license that permits their use and re-purposing by others.
OERs are educational materials made freely and legally available on the Internet for anyone to reuse, revise, remix and redistribute.
Examples of OERS include: textbooks, lesson plans, syllabi, entire courses, or other supplemental educational materials...anything that can be used to teach or learn.