A computer power supply is a crucial component that converts electrical energy from an outlet into usable power for a computer. It provides the necessary voltage and current to various parts of the system, including the motherboard, hard drives, and graphics cards. Power supplies come in different wattages, which determine how much power they can deliver. A higher wattage is often needed for more powerful components, such as high-end gaming graphics cards. Properly selecting a power supply ensures that all components receive adequate power for optimal performance and stability.