Brooklyn is one of the 5 boroughs of New York City. It is also called Kings County. Brooklyn is the second largest borough in land area. Brooklyn has more people in it than any of the other 5 boroughs. At the end of 2006, there were about 2.5 million people who lived there.
Brooklyn is named after a Dutch town called "Breukelen". The Dutch people were the first people from Europe to live in the area. When they got there, there were already some Native American people living there called the Lenape. The Dutch set up the city in 1634.