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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