Journal metrics assess the impact of a given academic journal by looking at the number of citations its published articles receive.
If you publish in highly cited journals, it is more likely that your research will have a significant impact.
Examples of Journal Metrics
Total Cites: Yearly citations to articles in a given publication
Impact Factor: The number of citations received by the average article in a given publication over the past two years.
5-Year Impact Factor: The number of citations received by the average article in a given publication over the past five years.
Eigenfactor: Weighted calculation that considers the number of citations a given publication receives as well as the source of those citations. Citations from higher impact journals are weighted more heavily.