What are universal product codes (UPCs)? Explain their use in packaging

What will be an ideal response?

ANSWER: A universal product code (UPC) is a series of thick and thin vertical lines, readable by computerized optical scanners that represent numbers used to track products. Because the numerical codes appear as a series of thick and thin vertical lines, they are often called bar codes. The lines are read by computerized optical scanners that match codes with brand names, package sizes, and prices. They also print information on cash register tapes and help retailers rapidly and accurately prepare records of customer purchases, control inventories, and track sales. The UPC system and scanners are also used in scanner-based research.