The Central Processing Unit (CPU) is the primary component of a computer that executes instructions and processes data—often called the computer's 'brain.' The CPU performs calculations, runs programs, and coordinates other hardware components. CPU speed (measured in gigahertz) and capabilities affect how fast a computer can perform tasks. Modern devices, from phones to servers, contain CPUs with varying power levels suited to their purposes. Understanding basic computing concepts like CPUs helps citizens appreciate the technology underlying digital services, from municipal websites to online government services. Advances in CPU technology continue to enable more powerful applications and services.