They were nomadic people who existed in Central Asia between 1st AD and the 7th century.
The Huns were the nomadic people or peoples, who were known to have lived in Easter Europe, the Caucasus and Central Asia between the 1st Century AD and the 7th century.
The Huns were a nomadic people who originated in north central Asia. They were known as fierce warriors who spent most of their time on small, swift horses; they reportedly even ate their meals and negotiated treaties on horseback. During the third century B.C. part of the Great Wall of China—which still stands today along the southern edge of the Mongolian plain—was built to keep the Huns out of China. Six hundred years later, in the third century A.D., the Huns occupied northern China, where they remained until 581. In the late third century they also began moving westward until they reached the Caucasus Mountains, which stretch between the Black and Caspian Seas. Along the westward route the Huns defeated the Visigoths and Ostrogoths, Germanic tribes who migrated in waves across Europe and conquered the Roman Empire around 410. In 434 Attila (406?–453) became king of the Huns and unified them as a people. A fearless leader, he launched attacks on the Visigoths in central Europe and the Ostrogoths in eastern Europe. By 450 the Huns occupied a large part of this region, but when Attila died in 453 the Ostrogoths revolted and regained possession of their territories. Eventually, through intermarriage, the Huns were absorbed into various European populations.
Further Information: Furnival, Mark. Peoples of the Dark Ages. [Online] Available http://www.btinternet.com/~mark.furnival/people.htm, October 20, 2000; "Huns." Electric Library.[Online] Available http://www.encyclopedia.com/articles/06152.html, October 20, 2000; "Huns." MSN Encarta.[Online] Available http://encarta.msn.com/index/conciseindex/65/065F1000.htm, October 20, 2000.