The design sprint is a step-by-step one week process enabling you to test big ideas fast. You start with a vague idea and by the end of the week, you'll have a high fidelity prototype. A real testable prototype, along with user feedback, informing about what should be developed further and what should be modified. Instead of spending lots of money and resources working on a long-term project that might never see the light of day, the tested prototype saves frustration, unnecessary expenses and keeps the team motivated. The design sprint might be for you, if you have a big project/problem you need to solve, if you are just starting out, you don't have the answer and it's going to cost a lot of time and money.