Kista is a district in the borough of Rinkeby-Kista, Stockholm, Sweden. It has a strategic position located in between Sweden´s main airport, the Stockholm-Arlanda International Airport and central Stockholm, and alongside the main national highway E4 economic artery. Kista comprises residential and commercial areas, the latter in the highly technological telecommunication and information technology industry. There are tremendous research efforts in this entire area, which therefore is dubbed Kista Science City. It is known as the research park of KTH Royal Institute of Technology.Kista, the largest Information and Communications Technology (ICT) cluster in Europe, is the world´s second largest cluster after Silicon Valley in California, the United States. It is the largest corporate area in Sweden, important to the national economy due to the presence of among others Ericsson Group, the largest corporation in Sweden.Kista Science City is the location where a large portion of the research and development of the world's 4G LTE mobile telephony infrastructure is being developed, which is natural since this is a European ETSI standard used worldwide and Kista Science City has been the largest such cluster in Europe for decades. A majority is done at Ericsson corporation, with 100 000 employees worldwide but with its research and worldwide Headquarters in the Kista Science City.