QR Code Fundamentals

QR Code란 무엇인가: 완벽한 입문 가이드

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The definitive beginner guide to QR codes — history, structure, how they work, and why they matter in 2026.

  
  

    
  








  
  

    
    
      
      
  1. 
        What Is a QR Code? A Complete Introduction
      
    2. 
      
      
  2. 
        How QR Codes Store Data
      
    3. 
      
      
  3. 
        A Brief History
      
    4. 
      
      
  4. 
        What Can You Store in a QR Code?
      
    5. 
      
      
  5. 
        Why QR Codes Matter in 2026
      
    6. 
      
      
  6. 
        Key Takeaways
      
    7. 
      
    

  









  
  

  
  

    
    

      
What Is a QR Code? A Complete Introduction


A QR code (Quick Response code) is a two-dimensional matrix barcode that stores data in a grid of black and white square modules. Unlike traditional one-dimensional barcodes, QR codes can encode information both horizontally and vertically, dramatically increasing module count." data-category="QR Code Structure">version, EC level, and mode." data-category="Error Correction">data capacity.


How QR Codes Store Data


Every QR code consists of several structural components working together. Three large finder patterns in the corners let scanners detect and orient the code from any angle. Timing patterns establish the grid coordinates, while the remaining modules encode your actual data using one of several encoding modes.


The data itself is protected by Reed-Solomon error correction, which allows a QR code to be read even when partially damaged or obscured.


A Brief History


QR codes were invented in 1994 by DENSO WAVE." data-category="History & Innovation">Masahiro Hara at DENSO WAVE, a subsidiary of Toyota. The original purpose was tracking automotive parts during manufacturing. Unlike existing barcodes that could only hold about 20 characters, QR codes could store thousands — and be scanned in any orientation.


DENSO WAVE made the critical decision to release the QR code specification publicly, which fuelled worldwide adoption. The technology was standardised as ISO/IEC 18004 in 2000.


What Can You Store in a QR Code?


QR codes support multiple content types through URI schemes and structured formats:



Why QR Codes Matter in 2026


QR codes have become essential infrastructure for mobile payments (Alipay, WeChat Pay, UPI), contactless menus, digital health certificates, and product authentication. Over 80% of smartphone users have scanned a QR code, and the technology continues to expand into augmented reality, NFC bridges, and identity verification.


Key Takeaways


    

  • QR codes are 2D matrix barcodes storing data in black-and-white module grids
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  • Invented in 1994 at DENSO WAVE for Toyota's manufacturing line
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  • Error correction allows scanning even with partial damage
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  • They support URLs, WiFi, contacts, payments, and dozens of other data types
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  • ISO/IEC 18004 is the governing international standard
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