Open access (OA) is a set of principles and a range of practices through which research outputs are distributed online, free of cost or other access barriers. The main focus of the open access movement is "peer reviewed research literature".
Open journals - the so-called "Gold open access", that is, publishing articles in scientific, peer-reviewed journals with open access. The costs of publication are borne by the author or the institution financing his research.
Open repositories - the so-called "Green open access", that is, depositing works in open repositories and archives.
For the institution:
For the author: