QR (Quick Response) codes are two-dimensional barcodes that can store various types of data. They can be scanned by smartphones and QR code readers to quickly access information.

Error correction allows QR codes to be read even if partially damaged or obscured:

• Low (L): 7% damage recovery - best for clean environments
• Medium (M): 15% damage recovery - general purpose
• Quartile (Q): 25% damage recovery - moderate damage tolerance
• High (H): 30% damage recovery - maximum durability

• URL: Website links that open in browsers
• Text: Plain text messages or information
• WiFi: Network credentials for easy connection
• Email: Pre-filled email with recipient, subject, and body
• Phone: Phone numbers for quick dialing
• SMS: Text messages with pre-filled number and message
• vCard: Contact information for address books

• Ensure adequate lighting when scanning
• Hold device steady and centered on the code
• Keep QR code flat and unobstructed
• Most modern smartphones have built-in QR scanners in camera apps
• For older devices, download a QR code reader app

• Test QR codes before printing or distributing
• Use high contrast (dark on light background)
• Include a quiet zone (white space) around the code
• Choose appropriate size based on scanning distance
• Use higher error correction for codes on curved surfaces