The Lake Country Museum has affixed QR Codes to their business cards, displays, historical markers and signage in order to enable smartphone and iPad users to easily access the Museum website.
QR Code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional code) first designed for the automotive industry. More recently, the system has become popular outside the industry due to its fast readability and large storage capacity compared to standard Universal Product Codes (UPC) barcodes [found on retail goods]. The code consists of black modules (square dots) arranged in a square pattern on a white background.
Formerly only for industrial uses, QR Codes have in recent years become common in consumer advertising and packaging, because of the popularity of smartphones. As a result, the QR Code has become a focus of advertising strategy, since it provides quick and effortless access to the brand’s website. They can generate and print their own QR Codes for others to scan and use by visiting one of several pay or free QR Code-generating sites or apps. Google has a popular API to generate QR Codes, and apps for scanning QR Codes can be found on nearly all smartphone devices.
QR Codes may appear in magazines, on signs, on buses, on business cards, or on almost any object about which users might need information. Users with a camera phone equipped with the correct reader application can scan the image of the QR Code to display text, contact information, connect to a wireless network, or open a web page in the telephone’s browser.
Source: Summary from the Wikipedia article on QR Codes