OERs are teaching, learning, and research resources that either reside in the public domain or have been released under an intellectual property license (Like CC-International) that permits their free use and re-purposing by others.
Visit Richardson Library's OER page HERE.
That according to Richardson Library's "Textbook Cost and Impact Survey" (2019):
Here are a few reasons instructors might want to use OERs:
Faculty can reduce the cost of course materials to lessen the burden on students,
Faculty can provide access to course content on multiple platforms and devices,
Faculty can offer students the opportunity of reviewing course content before enrolling,
Faculty can contribute to increasing academic performance and retention.