How Barcode is made?

A Barcode consists of 95 blocks.

Out of the 95 blocks; the barcode is written only in 12 blocks.

There are three blocks named as, left guard, centre guard and the right guard.

How barcode works?

As we know that a barcode is a square or rectangular image consisting of a series of parallel black lines and white spaces. The information is encoded between the length of each shaded line and the space between them.

A scanning device uses a laser to "read" the bar code by scanning in the unique bar of shaded lines. A barcode scanner reads the lines from left to right.

A barcode scanner reads pattern of black and white bars which turns the information in the binary code (0 or 1). 

Computer reads the information in the binary forms only and same is displayed on the screen of the monitor. 

Different numbers in the barcode show different quality of each product.

For example,

if "3" is written in the right side of center guard, it means the product is related to pharmacy.

also, if "2" is written in at the same place, in the right side of the center guard, it means the product may be vegetarian or non vegetarian.

Barcode is assigned to different countries of the world such as:

India: 890

Hong Kong: 89 

Germany:     40-44 

China:        690-692

Sri Lanka:    479

Japan:          45-49

United States and Canada: 00 -13 

United Kingdom: 50

 France:         30-37

 Russia:         46 

 Taiwan:       471 

 Philippines:  480