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An open access journal is a scholarly journal that provides free and unrestricted access to its content.
Hymenopus coronatus (Orchid Mantis) by Total Kamoki (License CC BY-NC-SA 2.0)
exploitative academic publishing business model that involves charging publication fees to authors without checking articles for quality and legitimacy, and without providing editorial and publishing services that legitimate academic journals provide. (Wikipedia - https://en.wikipedia.org/wiki/Predatory_publishing)