Answer
Impact factor is a measure of a journal's importance, calculated by counting how many times its articles are cited in a given period. A higher impact factor means a journal is more highly ranked.
To find high-impact journal articles, you can look for journals with high-impact factors and use resources that help you identify high-impact articles.
Some tools to use:
Journal Citation Reports (JCR)
CiteScore (available in Scopus)
Google Scholar Metrics
For more information on finding high-impact articles, see the Article-Level Metrics tab in the Faculty Toolkit for Publishing guide.