Dubai is one of the seven emirates that make up the United Arab Emirates. The main city of the emirate is Dubai. The city is sometimes called "Dubai City" to prevent it from being confused with the emirate.Dubai is located on the southeast coast of the Persian Gulf.The city has become symbolic for its skyscrapers and high buildings, in particular the world´s tallest building, the Burj Khalifa.Tourism is an important part of the Dubai government´s strategy to maintain the flow of foreign cash into the emirate. Dubai´s lure for tourists is based on shopping and its possession of other ancient and modern attractions.It is also increasingly becoming a center for service industries such as IT and finance. Transport links are helped by its rapidly-expanding Emirates Airline. The airline is based at Dubai International Airport and carries over 12 million passengers every year. It´s hard to believe that thirty years ago, Dubai was mostly desert. Today, it´s a metropolis that boasts the world´s largest mall, tallest tower, biggest dancing fountain and highest-rated hotel.Having expanded along both banks of the Creek, Dubai’s central business district is divided into two parts — Deira on the northern side and Bur Dubai to the south — connected by a tunnel and two bridges. Each has its share of fine mosques and busy souks, of public buildings, shopping malls, hotels, office towers, banks, hospitals, schools, apartments and villas.Outside this core, the city extends to the neighbouring emirate of Sharjah to the north, while extending south and west in a long ribbon of development alongside the Gulf, through the districts of Satwa, Jumeirah and Umm Suqeim to new Dubai.Burj Khalifa has redefined what is possible in the design and engineering of supertall buildings. By combining cutting-edge technologies and cultural influences, the building serves as a global icon that is both a model for future urban centers and speaks to the global movement towards compact, livable urban areas. The Tower and its surrounding neighborhood are more centralized than any other new development in Dubai. At the center of a new downtown neighborhood, Burj Khalifa’s mixed-use program focuses the area’s development density and provides direct connections to mass transit systems. Burj Khalifa’s architecture has embodied references to Islamic architecture and yet reflects the modern global community it is designed to serve. The building’s Y-shaped plan provides the maximum amount of perimeter for windows in living spaces without developing internal unusable area. As the tapering tower rises, setbacks occur at the ends of each “wing” in an upward spiraling pattern that decreases the mass of the tower as the height increases.