Heat

Heat is the main source of energy. The sun is fundamental part of it. All the living organisms has heat in their bodies. If heat stopped working then the body become dead.
In Physics heat is energy which move from hotter to cooler body.
There are many question arises like ,how heat produce?  how many types of it? etc .,
All the ans at next.

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Computer Devices

Computer is basically sum of devices related with their work. There are many devices which connected to a computer from inside and outside. Computer devices almost done different jobs in computer field. There are two main types of devices.

1. Input Devices     (ID)
2. Output Devices  (OD) 

General example of input device is "Keyboard" and output device is "Monitor".
Other Devices are listed below.

1. Communication Devices
2. Storage Devices
3. Processing Devices.

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Optical Reader

What is Optical Reader? Or
Define Optical Reader?
Optical Reader is a device that used for capture image into digital form. It is mostly found in scaners.
There are many other optical devices like "Bar Code Reader".

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