Journal Citation Reports (JCR) is a tool created by the makers of Web of Science.  It aggregated article-level citation data to generate citation-based information at the journal-level.

The most well known data in JCR is Impact Factors, a form of evaluating and ranking journal titles.  (More information about JCR and Impact Factors can be found in the Citation Tools unit.)

Start by locating and opening Journal Citation Reports from the library web site.  Click on the "databases" link on the left side of the page, then on "J" in the alphabet on the next page.