Open access (OA) journals are scholarly journals that are available online to the reader “without financial, legal, or technical barriers.” 

While open access journals are freely available to the reader, there are still costs associated with the publication and production of such journals. Some are subsidized, and some require payment on behalf of the author. The Neuroscience Knowledge Network which includes this top level Neuroscience Hub focuses primarily on open access content that falls under one of the Creative Commons (CC) licenses.