Open Educational Resources (OER) are digitized materials that are freely available for use, reuse, revision and redistribution. They include learning content, tools, and implementation resources across different subject areas. OER are based on the idea that knowledge should be shared openly for societal benefit. They are characterized by being openly licensed with few or no restrictions so they can be adapted and customized. OER provide benefits for students, academics, educational institutions, and governments by increasing access to educational resources and opportunities for collaboration.