Whats a hill station?

Someone sayd go to a hill station.. Well what is it?

Hill station, a term commonly used for towns founded in the Indian subcontinent by European colonial rulers to escape the summer heat, are at an altitude of approximately between 1,000 and 2,500 metres (3,500 to 7,500 feet); with very few outside of this range. The reason for hill stations being at higher altitudes is that they are cooler than plains; temperatures are lower owing to the lower density of air as one goes up in altitude, as thin air absorbs less heat from solar energy.

The British Raj, and in particular the British Indian Army, founded perhaps 50 of the 80-odd hill stations; the remainder were built by various Indian rulers over the centuries as places of leisure or even as permanent capitals. Some of the more popular hill stations in India are Gangtok, Darjeeling, Dharamshala, Dehradun, Auli, Kasauli, Kashmir, Khandala, Mahabaleshwar, Mount Abu, Munnar, Kodaikanal, Dalhousie, Kullu, Lonavala, Manali, Coorg, Coonoor, Khajjiar, Mussoorie, Nainital, Ooty, Shimla, and Srinagar.