'Metric' refers to all types of performance measure, a 'KPI' is a type of metric that allows us to measure the amount of 'something' that will significantly impact your business or decision-making. If you need a library of over 400 KPIs with explanations, worked example and basic definitions, check out Getting Started with KPIs. For topic-specific KPI Trees, including definitions, worked example and notes for the most useful KPIs, check out our Premium KPI Packs.