Open educational resources (OER) includes course content that can range from complete, peer-reviewed textbooks to smaller learning unit modules that can be plugged into courses. Usually, the materials are online and free. In many cases, the materials are peer-reviewed or developed by institutions and faculty then shared openly. Exploring OER does not conflict with the valuable materials provided by textbook publishers, bookstores, or other resource providers, but it does encourage conversation about cost, access, and quality.