A central processing unit (CPU)—also called a central processor or main processor —is the most important processor in a given computer. Its electronic circuitry executes instructions of a computer program, such as arithmetic, logic, controlling, and input/output (I/O) operations.

The most important part of your computer, if you had to choose just one, would be the central processing unit (CPU). It's the primary hub (or "brain"), and it processes the instructions that come from programs, the operating system, or other components in your PC.

The processor, also known as the central processing unit (CPU) is arguably the most important component inside any computer. Whether you’ve got one of the best processors on the market or you’re running an entry-level machine, your processor always serves as the brain of the operation.

The CPU is the core component that defines a computing device, and while it is of critical importance, the CPU can only function alongside other hardware. The silicon chip sits in a special socket located on the main circuit board (motherboard or mainboard) inside the device.

Open the Settings app on Windows and click the "About" tab to see what CPU is installed in your system. You can also press Ctrl+Shift+Esc to open the Task Manager and go to the "Performance" tab to view your CPU, or open the System Information utility to see all of your PC's hardware.