The impact factor of an academic journal (JIF) is a type of ranking. It reflects the ratio between the number of citations the journal's articles have received in the two preceding years and the total number of "citable items" it published during that time. A journal with a higher impact factor value is considered more prestigious or important within its field.
Although Shenandoah does not subscribe to Clarivate's Journal Citation Reports (JCR), which publishes impact factor calculations, this information typically can be found on a journal's website. Look for it on an "About" or "Information for Authors" page.
BrowZine, the library's app/site for browsing journals in a field, provides an alternative journal ranking, SCImago Journal Rank (SJR). When you look up a particular journal in BrowZine, you will see its SJR next to its title.
Clicking through to the SJR site will reveal more metrics about the journal, including its H index. (Both the SJR and the H index are defined here.)