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Wikipedia
Seoul is the capital and largest city of the Republic of Korea. With a population of over 10 million, it is one of the world's largest cities and is by far the most densely-populated city among OECD nations. The Seoul National Capital Area, which includes the Incheon metropolis and most of Gyeonggi province, has 24.5 million inhabitants, and is the world's second largest metropolitan area. Almost half of South Korea's population live in the Seoul National Capital Area, and nearly a quarter in Seoul itself, making it the country's foremost economic, political, and cultural center.

Seoul is the 2010 World Design Capital and has a technologically advanced infrastructure. Its Digital Media City has been a test-bed for some IT and multimedia applications. Seoul was the first city to feature DMB, a digital mobile TV technology and WiBro, a wireless high-speed mobile internet service. It has a fast, high-penetration 100Mbps fibre-optic broadband network, which is being upgraded to 1Gbps by 2012. Seoul Station houses the 350 km/h KTX bullet train and the Seoul Subway is the third largest in the world, with over 2 billion passengers every year. Seoul is connected via AREX to Incheon International Airport, which has consecutively been placed top in the Airports Council International's annual Airport Service Quality Awards since 2005.