Open Educational Resources (OER) are "high-quality teaching, learning, and research materials that are free for people everywhere to use and repurpose." - The William and Flora Hewlett Foundation
Open - Openly Licensed to Support "5R" Benefits - Retain, Reuse, Revise, Remix, and Redistribute.
Educational - Designed for educational use.
Resources - Materials that support teaching and learning, including textbooks, video, assessments, etc.
OER materials are released under an open license granting permission for every one to:
OER include learning materials such as: