Summary: A product design sprint is a structured five-day process that helps teams validate ideas quickly through problem definition, solution sketching, prototyping, and user testing. It reduces development risk, improves collaboration, and speeds up decision-making by gathering real user feedback before full-scale development. While design sprints require dedicated participation and may not suit every project, they remain an effective way to accelerate innovation, reduce wasted effort, and build products that better meet user needs.