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Everything you can see and touch in your PC is hardware. All the elements that go together to make up a PC fall into one of two categories, hardware or software.
Computer hardware is the physical part of a computer, including the digital circuitry, as distinguished from the computer software that executes within the hardware. The hardware of a computer is infrequently changed, in comparison with software and data, which are "soft" in the sense that they are readily created, modified or erased on the computer.
Most computer hardware is not seen by normal users. The motherboard is the main circuit board in a PC. It contains all the circuits and components that run the PC.
A power supply is installed in the back corner of the PC case, next to the motherboard.
The Hard disk derive installs in one of the 3-1/2 inch internal drive bays in the PC. It is secured by machine screws.
The Floppy Disk Drive installs in one of the external drive bays at the front of the PC case and is secured by machine screws. External means you can access the drive from the outside. It is powered by a cable with a 4-pin connector that comes from the power supply.
The mouse is the most common 'pointing device' used in PCs. Every mouse has two buttons and most have one or two scroll wheels.
The keyboard was the first input device developed for the PC. The standard keyboard layout provides 104 keys organized as four groups:
alphanumeric keys (A-Z, 0-9), location keys (home, end etc.), numeric keypad and function keys (F1-F12)
