Net revenue retention
Also: NRR; Net dollar retention
Revenue this year from last year's customers, including upsells and minus churn — expressed as a percentage.
Above 100% means existing customers grow even before new sales — the holy grail, and a top driver of valuation.
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Churn
The rate at which customers (logo churn) or revenue (revenue churn) leave over a period.
ARR / MRR
Recurring subscription revenue, annualised (ARR) or monthly (MRR) — the core SaaS growth metric.
Land and expand
Winning a small initial deal then growing the account over time with more seats, products or usage.
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