Hatsune Miku is a 16 yr Anime female android J-Pop idol that sings and dances in many AMV's.She is known for her green hair up in long pigtails.As her trademark she is often carrying a leak.The AMV's are created completely by the fans by using programs like "Vocaloids 2","Miku Miku Dance" and more advance "Anime video programs".Hatsune Miku becoming the overall most popular Vocaloid and the staple of Vocaloids 2. Vocaloids 2 is a singing synthesizer application software developed by the Yamaha Corporation/Crypton Future Media that enables users to synthesize singing by just typing in lyrics and melody. Hatsune Miku translated from Japanese to English. Hatsu - meaning " First " Ne - meaning " Sound " Miku - meaning - "Future" .So Hatsune Miku means - First,Sound,Future
The voice sampling for Hatsune Miku comes from Saki Fujita, a Japanese voice actress.
See Wikipedia: Hatsune Miku