Barcode

A barcode is a machine-readable code made up of black bars and white spaces that store and send information instantly when scanned. It works like a digital fingerprint for a product, carrying details like price, serial numbers, or batch codes.

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Barcodes are found everywhere. They help track, identify, and verify items fast and accurately, from supermarkets to pharmacies. 

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There are two main types of barcodes, 1D linear barcodes, and 2D barcodes. 

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1D (Linear) Barcodes

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These barcodes use vertical bars and spaces for basic product identification. Some common types include:

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• UPC (Universal Product Code): Found on retail products like groceries and books.
• EAN (European Article Number): Similar to UPC but used worldwide.
• Code 39: Used in manufacturing, defense, and the automotive industry.
• Code 128: A high-density barcode used in shipping and supply chains.
• ITF-14 (Interleaved 2 of 5): Commonly used for shipping cartons and logistics.

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2D Barcodes

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These barcodes store information both vertically and horizontally, making them more compact and data-rich. Some examples include:

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• QR Code (Quick Response Code): Used for marketing, payments, and website access.
• Data Matrix: Common in pharmaceuticals and medical devices for tracking and compliance.
• PDF417: Found on boarding passes, driver’s licenses, and government IDs.
• Aztec Code: Frequently used in transportation tickets for airlines and trains.

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Each barcode type is a unique key. It unlocks specific information for different industries. For example, it helps scan a soda can, track a medical device, or board a flight.
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