That because different types of barcodes are capable of handling different types of data, such as numeric and alphabetic characters, Kanji, Kana, Hiragana, symbols, binary, and control codes.When you use a bar code scanner to scan it , you can get the data that others put in it and via it, you can get to the product. I suggest you use a barcode generator to find it out. [Related links]
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The digits of a number in most cases, although some barcodes now can encode ASCII characters too.
Bar code stores numbers only,but QR code can be store be with any multimedia.
Disregard the first and last bar, they mark the beginning and end of the bar code. Each digit in a bar code is made up of 2 tall and 3 short bars, starting with the second bar read 5 bars as 7,4,2,1,0. which ever numbers has the tall bars add them to get the first digit of the bar code. 7 and 4 is 0.
The first product to have a bar code included was a packet of Wrigley's Gum.
look-up UPC code