Open Access provides unrestricted access to scholarly journal articles and allows for reuse. It has revolutionized scholarly communication and emerged as an alternative publishing model. There are two main forms - Gratis OA provides free online access while Libre OA provides free online access plus additional usage rights. Major challenges include building consensus, copyright issues, and managing digital content over its lifecycle. However, Open Access increases citation rates, visibility of institutions, and helps address issues in developing countries by democratizing knowledge.
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