I am sure most of us familiar with that sign. Almost items we buy at supermarket must have that sign. With that sign the store manager easy to manage that  all item in the store and it will make easy for teller to make know about that items include about its prices by shoning certain tool to  that item.

So, what actually Bar Code?  Bar Code is method of automatic identification and data collection. More about that read H E R E

Yes, Google is big because give many to us, and Google is always give high appreciate to everything useful for human being include about Invention of  the Bar Code.