Definition of a scanner

 Scanner is one of the computer input device. Scanner is a tool that serves to duplicate an object like a copier into a digital form. Scanner duplicate the object using a light sensor contained within it. Existing sensors on the scanner detects the structure, writing, and pictures of objects scanned and sent to a computer in digital form.

  Scanner is a device that is very helpful. With the scanner, we can duplicate hardcopy such as paper, paper, photo in digital form to a computer. So when we lose the source files such as photos, we can save the images to your computer. So when the photo was missing, or torn, we still have a stash on the computer. Moreover, if the photograph is a photograph memories of the first. Unfortunately that's just disappear?

  There is a sensor in a scanner. The sensor detects the structure, such as text, color, dark, light, and shapes. After the scanner sends the results of the scan to a computer in digital form. In order for the results of these scans can be edited or stored in a computer.

Gracious connection between the computer and scanner, can use several interfaces such as :
1. Parrarel
2. GPIB (General Purpose Interface Bus).
3. SCSI (Small Computer System Interface). 
4. USB (Universal Serial Bus).
5. Fireware.