OER stands for "Open Educational Resources" and is linked to an educational movement that began about 20 years ago and has become a global educational movement. Faculty who use OER in their courses are using freely available, high-quality educational resources in order to bring textbook costs down for students. OER, in essence, then are freely available, openly licensed resources -- textbooks, media, videos, articles, and more -- that are useful for teaching, learning, and assessing as well as for research purposes.