Open Educational Resources (OER) are teaching and learning materials that are available online for free reuse. Examples include full courses, modules, assignments, and other digital materials. Key is that OER are licensed for open use and modification. OER allow knowledge to be broadly shared and accessible to all, contributing to the global community and addressing the information needs of new learners. Popular sources of OER include The Orange Grove, OER Commons, MERLOT, and public libraries.