A QR code (quick response code) is a type of two dimensional (2D) bar code that is used to provide easy access to online information through the digital camera on a smartphone or tablet.

QR code Types-
Screenshot QR Code Generator
Website QR Code
Business Card QR Code
Wi-Fi QR Code
SMS QR Code
Email QR Code
Scan-to-Call QR Code
App Store QR Code
Event QR Code
Geocode
Text Code
Dynamic QR Code