OA is freely available, digital, online information. Open access (OA) is a publishing model for scholarly communication that makes research information available to readers at no cost.
Open Archives -- digital warehouse holding research, and other, outputs; allows for free and continuous access for consumers to read, download, and distribute
Open Publishers -- access + rights = open; work is typically published online with unrestricted access to read, download, and distribute; authors may incur a fee to publish
The three main types of open access are referred to as:
Green OA |
A version of the manuscript is freely available in a repository (self-archiving).
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Gold OA |
Final version of manuscript is freely available immediately upon publication by the publisher (fully open access journal).
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Hybrid OA |
Journal has both open and closed article access. Open access fee is usually paid by author during publication process.
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Thomas Shafee / CC BY (https://creativecommons.org/licenses/by/4.0)
Source: https://www.plos.org/files/HowOpenIsIt_English.pdf -- PLOS One