// definition
Product-Market Fit
Product-market fit is the stage at which your product satisfies a strong market demand: customers adopt it, keep using it, and tell others. A common signal is that at least 40% of users would be "very disappointed" if the product disappeared, alongside flattening retention and organic word of mouth.
Why it matters for developers
Marketing amplifies whatever you have — including a lack of demand. Chasing growth before product-market fit wastes money; confirming it first makes every later marketing dollar far more effective.
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