from Wikipedia Bangkok:
Bangkok, known in Thai as Krung Thep Maha Nakhon (pronounced [krūŋtʰêːp máhǎːnákʰɔn], กรุงเทพมหานคร (help·info)) or Krung Thep (กรุงเทพฯ (help·info)) for short, is the capital, largest urban area and primate city of Thailand. It was a small trading post at the mouth of the Chao Phraya River during the Ayutthaya Kingdom and came to the forefront of Thailand when it was given the status as the capital city in 1768 after the burning of Ayuthaya. However, the current Rattanakosin Kingdom didn't begin until 1782 when the capital was moved across the river after being sacked by the Burmese. The Rattanakosin capital is now more formally called "Phra Nakorn", pertaining to the ancient boundaries in the metropolis' core and the name Bangkok now incorporates the urban build-up since the 18th century which has its own public administration and governor.
In the span of over two hundred years, Bangkok has been the political, social and economic center of not only Thailand but for much of South East Asia and Indochina as well. Its influence in the arts, politics, fashion, education, entertainment as well as being the business, financial and cultural center of Asia has given Bangkok the status of a global city. The city's mix of Thai, Chinese, Indian, Buddhist, Muslim and Western cultures combined with the driving force of the Thai economy makes it increasingly attractive to foreigners both for business and pleasure and has made the city one of the the world's top tourist destinations.
Bangkok is the world's 22nd largest city by population with approximately 6,704,000 residents, but due to large unregistered influxes of migrants from the North East of Thailand and of many nations across Asia, the population of greater Bangkok is estimated at nearly 15 million people. This has in turn shifted the country from being a rather homogenous Thai population to increasingly a more vibrant mix of Western, Indian and Chinese people. The Bangkok Province borders six other provinces: Nonthaburi, Pathum Thani, Chachoengsao, Samut Prakan, Samut Sakhon and Nakhon Pathom and all six provinces are joined in the conurbation of the Bangkok Metropolitan Area.