The document defines open content as content that is available freely online for anyone to use, share and modify. Open content can be reused verbatim, revised by translating or adapting it, remixed by combining it with other materials, or redistributed by sharing copies. Examples of open content include educational resources on sites like MIT OpenCourseWare, Khan Academy videos, and Wikipedia articles. The document advocates for using open content in education to provide high-quality, up-to-date learning materials for all students while engaging in the emerging "global revolution" in open teaching and learning.