Open educational resources (OERs) are free educational materials that can be used and reused without cost. Some benefits of using OERs include saving students money, giving instructors more options for course materials, and improving educational resources as more contributors are involved. However, challenges exist as well - OER materials may not always be of high quality despite being free, resources can become obsolete without maintenance, and not all student needs may be met with available open options. Quality assurance and awareness of what OERs are also present challenges.