Minimum Viable Product
Experiment and test features without burning the development budget
Dev kits, 3D printing, cardboard, scissors glue and maybe even sticky back plastic
Great products solve the right products for the right customers at a price they are happy to pay. You can build the product first, take it to market and hope that your solution is accepted OR you can first try some quick, low cost experiments with select customers to check that the idea is worth pursuing and to tweak it based on real customer feedback.