QR (Quick Response) codes are two-dimensional barcodes that can store various types of information and can be quickly scanned by smartphones and other devices.

• Error Correction: Higher levels allow the code to be readable even if partially damaged.
• WiFi QR Codes: Allow devices to automatically connect to wireless networks.
• vCard Contact: Create QR codes that add contact information to address books.
• Size & Margin: Larger codes are easier to scan, and adequate margin ensures reliable scanning.
• Color Contrast: Ensure sufficient contrast between foreground and background colors.
• Testing: Always test your QR codes with multiple devices before using them.