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The journals are grouped into four main sections: ''Physical Sciences and Engineering'', ''Life Sciences'', ''Health Sciences'', and ''Social Sciences and Humanities''. Article abstracts are freely available, but access to their full texts (in [[PDF]] and, for newer publications, also [[HTML]]) generally requires a subscription or [[pay-per-view]] purchase.
Subscriptions to the overall offering hosted on ScienceDirect, rather than to specific titles it carries, are usually acquired through a so called [[Big deal (subscription model)|big deal]]. The other [[Big Five (publishers)|big five]] have similar offers.
ScienceDirect also competes for audience with other large aggregators and hosts of [[scholarly communication]] content such as academic social network [[ResearchGate]] and [[open access repository]] [[arXiv]], as well as with fully [[open access]] publishing venues and [[megajournal]]s like [[PLOS]].
== Background ==
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