This document provides definitions and information about open access resources. It defines open access as digital resources that are freely available without payment or authentication barriers. It also defines open access publishing models where authors make their work openly accessible. The document then lists different levels of open access from being able to read online to being able to distribute content. It provides examples of open access books, journals, textbooks, videos, and repositories. It defines repositories and digital libraries. Finally, it discusses traditional and beyond traditional repository services.