When you hear someone talk about publishing research in an open access journal you may hear them refer to gold or green open access models. It is helpful to understand the distinction between the two.
Gold Open Access - The publisher makes all articles available for free. Some journals may charge publishing fees, but these can often be covered by a grant or sponsoring agency.
Green - Self-archiving by the author is permitted. The author can post on their own website, an institutional repository such as our repository, DigitalCommons@CSP, or a disciplinary repository. The author's agreement with the publisher will determine which version of the article is permitted to be archived (e.g., preprint, accepted, postprint, etc.). Sherpa Romeo is a tool that authors can use to check the standard open access policies for many journals.