Every big company you admire began as a tiny spark in someone’s mind—a solution to a nagging problem, a better way of doing something ordinary. Entrepreneurship is the engine that turns those sparks into real businesses, creating jobs, new products, and fresh momentum in the economy. In this chapter, we’ll walk through the entire journey, from spotting an idea to leaving the business when the time is right, so you can see exactly what it takes to build something from nothing.