Journal Citation Reports can be accessed from the Web of Science database and is an authoritative source of Journal data such as the Impact Factor and Subject Specific Journal rankings. It allows you to evaluate and compare journals using citation data drawn from over 11,000 scholarly and technical journals from more than 250 disciplines. JCR provides quantitative tools for ranking, categorising, comparing and evaluating journals. The Impact Factor is one of these, and measures the frequency with which the average article in a journal is cited in a particular year.
Read more about the Impact Factor.
Journal metrics are used to evaluate the quality or caliber of the journal in which articles are published and should not be used to make any assessment at the article level. The Impact Factor and CiteScore is not an indication of article quality.