Why it required more than 1 stage for rocket?

Rockets require more than one stage to efficiently reach space due to the need to shed weight as they ascend. Each stage contains its own engines and propellant, which are jettisoned when they are no longer needed, reducing the rocket's mass and allowing the remaining stages to accelerate more effectively. This multi-stage design optimizes fuel use and increases overall payload capacity, enabling rockets to reach higher velocities and altitudes. Additionally, staging facilitates the use of different engine types optimized for specific atmospheric or vacuum conditions.