What component typically handles the processing function of a computer?

The Central Processing Unit (CPU) is recognized as the primary component responsible for the processing function in a computer. It acts as the brain of the computer, performing calculations, executing instructions, and managing the flow of information throughout the system. The CPU interprets and carries out program commands, which is essential for all computer operations.

The power supply, while vital for providing the necessary electrical energy to all components, does not handle any data processing or execution of tasks. The graphics card, on the other hand, specializes in rendering images and video, offloading graphical tasks from the CPU but is not the primary processor for general computing tasks. Lastly, the hard drive is used for data storage but does not play a role in processing data; it merely retains information needed for the CPU to function effectively.

Thus, the CPU is the correct answer, as it is the core component that executes and manages operations within the computer.