What is a Barcode?

A barcode is a visual representation of data that can be read by machines. It consists of black and white bars and spaces, which is why it's called a "barcode." The barcode was first invented by Norman Joseph Woodland in 1948, and in 1974, a pack of gum became the first product sold using barcode scanning at a supermarket in Ohio. Today, barcodes are essential in virtually every industry, including retail, logistics, healthcare, and manufacturing.

Barcodes work using the principle of light reflection. When light emitted from a barcode scanner hits the barcode surface: • **Black bars**: Absorb light, resulting in less reflection • **White spaces**: Reflect light back to the scanner The scanner detects these differences in reflection patterns, converts them to electrical signals, and interprets them as digital data. The width of bars and spaces represents different numbers or characters.

A typical 1D barcode consists of the following structure: 1. **Quiet Zone**: Empty space at the beginning and end of the barcode, necessary for the scanner to recognize where the barcode starts and ends. 2. **Start Character**: A special pattern that signals the beginning of the barcode. 3. **Data Area**: The combination of bars and spaces where actual information is encoded. 4. **Check Digit**: A number used to verify scanning errors. 5. **Stop Character**: A special pattern that signals the end of the barcode.