What Are QR Codes?

QR (Quick Response) codes are two-dimensional barcodes that can store various types of data. Originally developed in 1994 for tracking parts in vehicle manufacturing, they're now widely used for many purposes.

How QR Codes Work

QR codes work by encoding data in a pattern of black squares arranged on a white square grid. When scanned by a QR reader (typically a smartphone camera), the pattern is decoded to reveal the stored information.

Types of Data QR Codes Can Store

• URLs: Direct users to websites
• Text: Display plain text when scanned
• Contact information: Save as a contact (vCard format)
• Email: Pre-populate an email
• SMS: Pre-populate a text message
• Wi-Fi credentials: Connect to a network
• Calendar events: Add events to calendar

Benefits of QR Codes

• Fast scanning and data retrieval
• High data capacity compared to traditional barcodes
• Error correction capability (can still work when damaged)
• No special equipment needed (works with smartphone cameras)
• Can be dynamically generated and tracked

Common Uses of QR Codes

• Product packaging for additional information
• Business cards with contact details
• Restaurant menus
• Event tickets and boarding passes
• Payment systems
• Marketing campaigns
• Authentication and security

QR Code Security Considerations

While convenient, QR codes can pose security risks:

• Malicious codes can direct to phishing sites
• Codes can trigger unwanted actions (calls, texts, etc.)
• Always verify the URL before entering sensitive information
• Use a QR scanner that previews the action before executing