Open Educational Resources (OER) are free educational resources. For the resource to be true OER it must be FREE in one of two ways:
Affordability - FREE FREE FREE! The rapidly rising costs of college textbooks are forcing some students to look at required texts as "optional". Using free resources in the classroom makes education more available and accessible while promoting success and completion.
Flexibility - Faculty have the ability to customize many OER materials to fit the needs of their course.