A ubiquitous city or U-city is a city or region with ubiquitous information technology. All information systems are linked, and virtually everything is linked to an information system through technologies such as wireless networking and RFID tags.
The concept has received most attention in South Korea, which is planning to build some 15 ubiquitous cities. The largest of these will be Songdo, constructed on fill off the coast of Incheon. Songdo, or New Songdo City, is expected to open in 2014. The smaller Future-X development in Daejeon is scheduled to open in 2009 .
The concept has also been studied in other countries such as Japan. Osaka held a 2003 conference on ubiquitous cities, and continues to push for various implementations of the concept.