The term KPI is an acronym that stands for Key Performance Indicator. It is a metric that a businesses use to track productivity.

Here are three helpful articles that go into more detail:

1. 18 Key Performance Indicator Examples Defined For Managers
2. The 75 KPIs Every Manager Needs To Know
3. The 10 Marketing KPIs You Should Be Tracking

And of course, you can also perform a Bing search or a Google search to learn more about the term.