Open Educational Resources (OER) are resources available over the Internet that can be used for teaching, learning, or research.
The term OER, according to The William and Flora Hewlett Foundation, represents the "teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and re-purposing by others. Open educational resources include full courses, course materials, modules, textbooks, streaming videos, tests, software, and any other tools, materials, or techniques used to support access to knowledge."