Most of the smartphones nowadays have to ability to scan QR codes. A lot of information can be put into the barcode, such as business cards and most commonly website URL.
Sometimes you want to copy some short messages/info such as an address from your PC to your phone. Sure you can just take a picture of your monitor, but you cannot edit or send it via SMS. What I do is I just create the QR code (took less than 1 second) and just scan it with my phone. Then I can share it via SMS or whatsapp :)
Here's how:
1) Go to the website and paste any text/website link in the textbox.
2) Select an image size and click 'Create QR Code'.
3) You can now right click -> save the picture, or just share the link below it.