The physical part of computer, which we can see, touch and feel are collectively called hardware. The computer and all the peripheral devices such as printers, scanners, microphones, speaker and wavecams etc are hardware. Peripheral devices are hardware devices that are connected to the motherboard but not part of the main computer system and were added latter to the system.
Key board :
It just like a type-writer which contains key to feed the data information into the computer. It is attached with the system unit through a cord. Standard and IBM keyboard have 83 keys while enhanced keyboard has 104 keys. It communicates user to the computer. A computer's keyboard has many more keys that does several more function.
Monitor :
This is the most popular input/output device looks like a small TV and shows you what is going on. It has two cords, one for power and other for connecting to the system unit. When commands are given to computer through the keyboard are displayed on monitor.
Mouse :
It is an input device and is used to point and select items on your computer screen I.e. for controlling the movement of the cursor on the computer screen. By sliding the mouse on a flat surface the user clicks the mouse to select the items. A single cord present on the back side of system unit used to connect it. Today's cordless mouse are available in the markets. The left and the right click have different functions depending on the software being in use.
Scanner :
It is input device that scans photos, graphs, diagrams or any handwritten matters and transfers to the computer in digital form.
Printer :
It is the primary output device used to prepare permanent documents in readable form, such readable document are called 'hard copy'.
Speaker :
It is an output device, often it is used for entertainment. It is connected to the sound cord of the system unit. The output as a sound can be heard in the speaker.
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