lesson
Updated 6 days ago · 1 view
When you walk into a grocery store, a red laser instantly beeps your cereal box, the doors open by themselves, and cold air keeps the milk fresh.
Local shops use different kinds of technology — tools and machines that solve problems — to help us get what we need and want quickly and safely.
How do these machines help cashiers ring up groceries in seconds?
Scanning and Paying
Every packaged item has a barcode, which is a pattern of black and white stripes that stores a special number for that product.
A barcode scanner shines light onto the stripes, reads the number code, and instantly finds the price stored in the store's computer.
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When it is time to pay, a card reader lets customers tap a plastic card or phone to pay with digital money instead of paper cash.
What happens behind the scenes to make sure the store doesn't run out of your favorite snacks?
Tracking What We Buy
Shops need to know exactly how many items are left on the shelves using a system called inventory tracking.
Every time the scanner beeps an item, the computer automatically subtracts one from the total count and can alert the shopkeeper to order more.
📊Interactive diagram