MRR (Monthly Recurring Revenue) is the predictable revenue that returns each month in a subscription business. Unlike a one-time payment, it's stable and forecastable — which is why it's one of the most important metrics for SaaS.
MRR growth is driven by three factors: new customers, upgrades (expansion) from existing ones, and churn. For steady growth, curbing churn is the most effective way to raise MRR.
