In this section of the OCR GCSE (J277) curriculum, we explore the fundamental role of the CPU in a computer system through the concept of the fetch-execute cycle. The CPU, also known as the Central Processing Unit, acts as the brain of the computer, executing instructions and performing calculations. The fetch-execute cycle is a process where the CPU fetches instructions stored in the computer’s memory, decodes them, executes the necessary operations, and then stores the results. This continuous loop is essential for the smooth running of programs and operations on a computer. Understanding the fetch-execute cycle is crucial for students studying computer science, as it forms the basis of how a computer processes and executes commands. By grasping this concept, students can deepen their knowledge of how computers function and how different components work together to carry out tasks efficiently.