2010 (MMX) was a common year that started on a Friday in the Gregorian calendar. It was the 2010th year of the Common Era or the Anno Domini designation; the 10th year of the 3rd millennium and of the 21st century; and the 1st of the 2010s decade.
The United Nations designated 2010 the International Year of Biodiversity and International Year of Youth.
Among experts and the general public, there is a debate as to how specific years of the 21st century should be pronounced in English. The year 2010 is pronounced either "twenty ten" or "two thousand (and) ten".
