The philosophy of open access (OA) is relatively simple -- published information should be freely available. In its most basic form, OA refers to the publishing of peer-reviewed articles in such a way that allows internet users to access the material without having to go through a paywall. Just 7 years ago, only a small number of publishers allowed authors to post final articles in a fully OA manner. Now, the largest journal on the planet (PLOS ONE) is fully OA, publishing more than 20,000 articles a year.
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