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Barcodes look like black and white lines (or boxes, in QR codes) but they’re really just a way to store numbers and letters that a scanner can quickly read. How you read them depends on what type of barcode it is. Here’s a simple guide:

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1. Linear (1D) Barcodes (like on products in shops)
• Example: UPC, EAN, Code 39, Code 128.
• What they mean: Each set of thick and thin black lines represents numbers (and sometimes letters).
• How to read manually:
• Look at the numbers printed under the barcode — those are what the lines encode.
• Example: On a milk packet, the barcode might show 8901234567890. That number is the product’s unique ID.
• How scanners read:
• A scanner shines a laser or light across the barcode.
• Black bars absorb light, white spaces reflect it.
• The pattern is translated into numbers/letters.

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