What a CPU Does
A CPU is like the brain of your computer. It reads instructions from programs you run, understands what those instructions mean, and then performs the actions they ask for. Every time you click a mouse, type on a keyboard, or open an app, the CPU is working behind the scenes to make those things happen. Without a CPU, a computer cannot function at all.
The Fetch-Decode-Execute Cycle
The CPU works through a repeating process called the fetch-decode-execute cycle. First, it fetches an instruction from memory. Next, it decodes that instruction to understand what it needs to do. Finally, it executes the instruction by performing the required action. This process happens billions of times per second in modern computers.
Processing Data
CPUs process different types of data including numbers, text, images, and sounds. They perform mathematical operations, compare values, and make logical decisions. For example, when you load a webpage, the CPU processes the code that creates the page you see. When you play a video game, the CPU calculates where characters move and how they interact.
Coordination Role
The CPU coordinates all the other parts of a computer like the memory, storage drives, graphics card, and input/output devices. It sends instructions to these components and receives information back from them. This coordination ensures everything works together smoothly to run your programs and applications.
CPU Speed and Performance
CPU speed is measured in gigahertz (GHz), which represents how many billions of instructions it can execute per second. A faster CPU can process more instructions quickly, which makes programs run faster. Modern CPUs also have multiple cores, meaning they can process several instructions at the same time, improving overall performance. 
Answer