Software is a lever on the real world.
Someone writes code, and all of a sudden, riders and drivers coordinate a completely new kind of real-world transportation system, and we call it Lyft. Someone writes code, and all of a sudden, homeowners and guests coordinate a completely new kind of real-world real estate system, and we call it Airbnb. Someone writes code, etc., and we have cars that drive themselves, and planes that fly themselves, and wristwatches that tell us if we’re healthy or ill.