Open Educational Resources (OER)
Open Educational Resources (OER) are teaching, learning and research materials in any medium – digital or otherwise – that reside in the public domain or have been released under an open license that permits no-cost access, use, adaptation and redistribution by others with no or limited restrictions.
Since 2002, when the term Open Educational Resources (OER) first emerged, to today, OER has increasingly been recognized by the international community as an innovative tool for meeting the challenges of providing lifelong learning opportunities for learners from diverse levels and modes of education worldwide.
UNESCO, Open Educational Resources (OER)