Which component is primarily responsible for executing instructions of programs?

Which component is primarily responsible for executing instructions of programs?

• A. Random Access Memory (RAM)
• B. Graphics Processing Unit (GPU)
• C. Hard Disk Drive (HDD)
• D. Central Processing Unit (CPU)

Answer: (D)

The main idea here is who runs the steps of a program. The component that executes instructions is the central processor. It repeatedly performs the fetch-decode-execute cycle: it fetches an instruction from memory, decodes what the instruction asks it to do, and then executes the operation, such as math, logic, or moving data. The control unit steers this process, and the ALU (arithmetic/logic unit) carries out the actual calculations. RAM holds the program’s data and instructions while the program runs, but it does not perform the execution itself. The hard drive stores data and programs long-term, not while they are actively running. The graphics processor handles graphics-related tasks and can accelerate certain computations, but the core execution of general program instructions is done by the CPU.

The main idea here is who runs the steps of a program. The component that executes instructions is the central processor. It repeatedly performs the fetch-decode-execute cycle: it fetches an instruction from memory, decodes what the instruction asks it to do, and then executes the operation, such as math, logic, or moving data. The control unit steers this process, and the ALU (arithmetic/logic unit) carries out the actual calculations. RAM holds the program’s data and instructions while the program runs, but it does not perform the execution itself. The hard drive stores data and programs long-term, not while they are actively running. The graphics processor handles graphics-related tasks and can accelerate certain computations, but the core execution of general program instructions is done by the CPU.