2. Out Put device

Input Device of Computer
1. Keyboard: It is known as primary input device. It is also known as typing device, because we can input the data and instruction by typing. It have different types of key combination such as, alphabetical keys (A to Z), numerical keys (0 to9), Function keys (F1 to F12) Arrow keys (Right, Left, Down and up) and other keys, Most of the keyboard have QWERTY layout; The keyboard have 102 to 108 keys and in FCC standard
2. Mouse: - It is other types of input device and also known as pointing device. By using the mouse pointer we can perform the works at computer. When we move the mouse the pointer will move to the same direction and when we click in certain command field the work mentioned at the command field will be performed. The mouse has to buttons (left and right). The left button is used for normal work and right button is used for other works. The stroller of mouse is used to move the working file up a down. The mouse is of three types they are Serial Mouse, Ps/2 Mouse and USB Mouse.
3. Scanner: - It is also another type of input device of computer. Especially this device is used to convert the hand copy data into soft copy and send the data to the computer. Basically used to input the picture files to the computer.
4. Digital Camera: - We can use this device to input the digital picture files to the computer we can connect the digital camera at computer by suing the USB port.
5. Joystick: - It is one type of control device, which is used for gaming option. This device is specially designed to play game at computer.
6. Light pen: - It has the light sensitive detector at its tip and it generates the light we should use this device at the pad, when we write something at pad the hand writing will input to the computer also it as known as input device.

2. Out Put device

Monitor: It is primary output device of computer and also known as VDU (Visual Display Unit) because it provides all the result to the user visually It is also known as soft copy output device, Because we can't touch the data displayed on it and we can easily edit the data on it the monitors are different types according to its technology such as;
- Monochrome Monitor: - Provide the result in black and white display.
- Color Monitor: - Provides the result colorful.
- CRT Monitor (Cathode Ray Tube):- This type of monitor uses one vacume tube which is known as cathod Ray tube to display the image and objects.
- LCD (Liquid Crystal Display):- It is more advanced than CRT monitor. It is very thin in size and uses the liquid crystal to form objects.

Printer: - It is known as hand copy output device, when we give print command to the computer, the printer gives the result at printed form on the paper. So we can easily touch the printed data. But we can not edit the printed data. We can categorize the printer into two types. They are;-
i) Impact Printer: - The printer which hits on the paper while printing is known as impact printer. Such as Dot Matrix Printer.
ii) Non Impact Printer: - The printer which sprays the liquid or powder ink at the paper to form on object is known as non- Impact printer it doesn't hit at the paper while printing. Such as Bubble jet printer , laser printer
Plotter: - It is also hand copy output device. Especially this device is used to print the high Quality graphics in large size.Motherboard: - It is the main PCB (Printed Circuit Board) of Computer. The main work of this board is to flow the data from one location to another it contains different sections and it have its own speed which is known as but speed. (Data transfer speed)
It have the microprocessor socket to connect the microprocessors, RAM slots, PCI slots, ISA slots, AGP slots, H.D.D. controller, F.P.P. Controller, keyboard Controller and other sections.
Processor: - It is used to process the raw data input by using different types of input device. It has its own processing speed. It is connected at processor socket of motherboard
RAM (Random Access Memory) It is temporary memory of computer. It can store the data while the electricity is flowing
H.D.D. (Hard disk drive):- It is permanent storage Media of Computer. It stores all the operating system, programs and all the files and folder of the computer, It have it's own storage capacity
CDROM: - It can read the data of CD's – especially this device is used to read and display the contains of the CDS.
F.D.D. (Floppy disk drive):- the drive which is used to operate 1.44 MB floppy disk. The main work of this device is to read and write the data on the floppy disk.