What function does the central processing unit (CPU) serve in a computer?

The central processing unit (CPU) serves as the brain of the computer, primarily responsible for interpreting and processing data. This means that the CPU takes instructions from programs, performs computations, and manages the flow of information throughout the system. It executes all the core operations necessary for a computer to function, including arithmetic calculations and logical comparisons, which are essential for tasks ranging from running applications to managing system processes.

In contrast, the other functions described in the choices do not accurately represent the role of the CPU. For example, while the CPU engages with peripheral devices, it does not physically drive them; that role is typically handled by other components like the chipset or controllers. Similarly, data storage is managed by memory and storage devices rather than the CPU itself, and connecting to the internet is facilitated through network interfaces, not directly performed by the CPU. Thus, the CPU's primary and defining function is to interpret and process data, making that answer the correct choice.