In computing, which component is primarily responsible for executing program instructions?

• A. Central Processing Unit
• B. RAM
• C. GPU
• D. ROM

Answer: (A)

The main concept is that the component responsible for actually running program instructions is the central processing unit. It performs the fetch-decode-execute cycle: it fetches an instruction from memory, decodes what action is needed, and then executes it, using its arithmetic logic unit for calculations and its control unit to orchestrate operations. This is why the CPU is considered the brain of the computer—it handles instruction processing and control flow.

RAM stores data and instructions while programs run, but it doesn’t execute them; ROM holds firmware and is non-volatile but also doesn’t execute general instructions. The GPU is specialized for parallel processing tasks like graphics, rather than executing ordinary program instructions.