Repositories are digital collections of the scholarly outputs created within a university or research institution. The main purposes of repositories are to provide open access to the institution’s research output. The online repositories now run by most major research universities. Universities can deposit any research papers that has required to be freely available. The university online repositories will make some substantive version of all its research outputs available online in a free-to-view form. The contents of all repositories are indexed by Web search engines such as Google and Google Scholar. Therefore, repositories are maximizes the visibility and impact of research outputs.