Product
Product-Market Fit
Product-market fit is the state in which a product meets real, urgent demand in a specific market, evidenced by strong retention, organic growth and customers who resist giving the product up.
Common signals include flattening retention curves, unprompted word-of-mouth acquisition, and support volume driven by usage rather than confusion.
Fit is market-specific: a product can have clear fit with startups and none at all with enterprises, and treating those as one market is a frequent strategic error.