But now we find a truly innovative use of rubber stamps that brings that pre-20th century technology into the 21st. It all has to do with something called "QR Codes". They are a standard of two-dimensional bar codes, and can be used for a variety of scanned identification purposes, much like the more common bar codes we'd find pasted on the side of grocery store items.
One use that's becoming more popular, especially in Japan, is to encode a website URL into a QR Code. Then by scanning the QR Code, typically done with a mobile phone equipped with a camera and some software, the URL is decoded, a web browser is launched, and presto - you're at the website!