Open educational resources (OER) provide teaching and learning materials that are freely available online for anyone to use, with some allowing modified copies to be distributed. The document discusses several examples of OER, including Connexions which hosts a global repository contributed by anyone, and Khan Academy which provides over 800 YouTube tutorials on math, science and finance. It also mentions Wikiversity for pre-school through post-secondary education resources, and Wikimedia Commons which contains public domain and freely-licensed educational media like images and video clips. The goal of OER is to make educational content more openly accessible consistent with copyright rules.