What is Product-Market Fit?
The point at which a product satisfies a market well enough that growth becomes pull-driven rather than push-driven.
Marc Andreessen's original definition: 'You can always feel when product-market fit isn't happening.' The signals are concrete, customers buy faster than you can sell, retention shapes a smile curve, NPS sits above 50, and the team's biggest problem becomes scaling, not selling. Sean Ellis quantified it with the 40% rule: if 40% of users say they'd be 'very disappointed' without your product, you have fit. PMF is not permanent, markets shift, and many companies lose fit they once had.
Related terms
Minimum Viable Product (MVP)
The smallest version of a product that lets a team test a critical assumption with real customers, not the smallest version they can ship.
North Star Metric
The single metric that best captures the value a product delivers to its customers and predicts long-term business success.
Product Discovery
The structured work of figuring out what to build by validating customer problems and solution assumptions before delivery.
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