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The Central Processing Unit, commonly known as the CPU, is referred to as the brain of the computer because it is responsible for executing instructions and processing data. It performs calculations, runs applications, and manages the flow of information throughout the system. The CPU interprets and executes program instructions, coordinating with other hardware components and peripherals to facilitate all operations of a computer.

In contrast, the other components play different roles. The Graphics Processing Unit (GPU) handles rendering images and video, making it crucial for graphics-intensive tasks but not for general computing functions. Random Access Memory (RAM) serves as the system's short-term memory, temporarily storing data that the CPU needs to access quickly, but it does not process instructions itself. The Power Supply Unit (PSU) provides electrical power to the computer's components, which is essential for operation, but it does not perform any computational tasks. Therefore, the CPU is uniquely positioned as the central unit that performs processing operations, making it the component referred to as the brain of the computer.