Definition card: minimum viable product
A minimum viable product is the smallest version of a product that is good enough to sell to real customers and learn from their response. "Minimum" means only what a buyer needs to judge it. "Viable" means it can survive in the market: people want it, it works as promised, and it can be made and sold at a profit.
Prototype to Productionstresses the second word. A sample that looks right but cannot be produced at a sensible margin is a prototype, not an MVP. That is why Cydney Mar's Concept-to-Reality Pathway pairs prototypes with cost and margin work before production.