An institutional repository is an archive for collecting, preserving, and disseminating digital copies of the intellectual output of an institution, particularly a research institution.
An institutional repository can be viewed as a "...a set of services that a university offers to members of its community for the management and dissemination of digital materials created by the institution and its community members." For a university, this includes materials such as monographs, eprints of academic journal articles—both before (preprints) and after (postprints) undergoing peer review—as well as electronic theses and dissertations. An institutional repository might also include other digital assets generated by academics, such as datasets, administrative documents, course notes, learning objects, or conference proceedings. Deposit of material in an institutional repository is sometimes mandated by that institution.
Some of the main objectives for having an institutional repository are to provide open access to institutional research output by self-archiving in an open access repository, to create global visibility for an institution's scholarly research, and to store and preserve other institutional digital assets, including unpublished or otherwise easily lost ("grey") literature such as theses, working papers or technical reports.
Digital institutional repositories are document servers enabling researchers to archive their research output. Worldwide institutions are starting to implement digital institutional repositories for digital formats of research. Scholarly output can be born-digital, in which no digitalisation is necessary before the research is includes in a digital repository. A digital institutional repository accessible through the internet can improve the visibility, usage and impact of research conducted at an institution.