This document provides an overview of open access (OA) publishing and its benefits. It discusses how OA provides free access to scholarly works online, benefiting readers, authors, and fields of study. Both "gold" OA journals that are open from inception, and "green" OA that allows authors to self-archive in repositories, are covered. While traditional publishers claim most readers have access via libraries, the presentation argues that OA benefits many beyond academic institutions as well. Peer review and impact are independent of open access status.