What Are OERs?
As for what is OER, we rely on this definition from OER Commons:
“Open Educational Resources (OER) are teaching and learning materials that you may freely use and reuse at no cost. Unlike fixed, copyrighted resources, OER have been authored or created by an individual or organization that chooses to retain few, if any, ownership rights. In some cases, that means you can download a resource and share it with colleagues and students. In other cases, you may be able to download a resource, edit it in some way, and then re-post it as a remixed work. How do you know your options? OER often have a Creative Commons or GNU license to let you know how the material may be used, reused, adapted, and shared.”
Student Guide to Open Educational Resources” by North Essex Community College is licensed under CC BY 4.0
OERs  are fairly new to the educational system, but have been gaining popularity and are being used more commonly on the web.
The high cost of textbooks and materials prevents many students who want to pursue higher education from achieving their goals. College of the Canyons is beginning to use OERs to bring these costs down. 

For more information you can also read OER Student Phamplet.pdfOER Student Pamphlet.
Why should students choose OER? Read Why OER​ to find out more.

College of the Canyons
Open Educational Resources