Open Access (OA) describes scholarly literature that is digital, online and free of charge.
Open Educational Resources (OER) are teaching, learning, and research materials in any medium which reside in the public domain or have been released under a Creative Commons (CC) licence permitting no-cost access, use, adaptation, and redistribution by others.
This diagram below provides a visual overview of the different degrees of openness of the Creative Commons licenses. For a detailed explanation of each licence, please visit Creative Common's licenses.
Adapted from "Creative commons license spectrum" by Shaddim