Open Educational Resources (OERs) are teaching, learning, and research resources that are freely available and offered online for anyone to use. They are published with a Creative Commons license. Depending on the type of license, you may have the option to reuse, revise, remix, retain, and redistribute the content.
Before using an OER check its license and understand what it allows you to do. Watch this Creative Commons license video or read about how to apply and use Creative Commons licenses.