What is the role of the CPU in a computer system?

The CPU, or Central Processing Unit, is often referred to as the brain of the computer because its primary role is to process instructions and execute commands. It takes inputs from various sources, such as users or applications, performs calculations or logical operations on this data, and then produces outputs based on the processing. This includes managing the execution of programs, controlling the flow of data between the system's components, and carrying out the instructions that make up computer applications and the operating system itself.

The CPU operates in a cycle known as the fetch-execute cycle, where it fetches instructions, decodes them, and executes them. This is crucial for running all software applications, as the CPU interprets and carries out the code that dictates how programs behave, making it the fundamental component necessary for computing tasks.

Other choices describe functions that are generally managed by different components of the computer system. For example, data storage is primarily handled by storage devices such as hard drives or solid-state drives, while user interface management is typically performed by the operating system and software applications. Connecting external devices falls under the responsibilities of peripheral interfaces and controllers, not the CPU directly.