What function does a CPU serve in a computer?

The CPU, or Central Processing Unit, is often referred to as the brain of the computer. Its primary function is to process and execute instructions. This includes performing calculations, running applications, and managing data by executing the commands provided by software and the operating system. The CPU interprets the instructions from programs and translates them into commands that the computer's other components can understand and act upon, allowing the entire system to function smoothly. This role is crucial for the operation of any computer, as it enables the machine to perform tasks effectively.

The other options do not accurately describe the purpose of the CPU. While the computer does have storage devices for files, generates power from a power supply unit, and can provide a visual interface through peripherals like monitors, these functions are handled by different components of the computer system.