Open Educational Resources and open access refers to the practice of making peer-reviewed scholarly research and literature freely available online to anyone interested in reading it. Open access resources are digital publications, including individual scholarly journals, books, and repositories of scholarly works, that are freely accessible on the World Wide Web. Open access has two different versions - gratis and libre.
Gratis open access is simply making research available for others to read without having to pay for it. However, it does not grant the user the right to make copies, distribute, or modify the work in any way beyond fair use.
Libre open access is gratis, meaning the research is available free of charge, but it goes further by granting users additional rights, usually via a Creative Commons license, so that people are free to reuse and remix the research. There are varying degrees of what may be considered Libre open access.