Hatsune Miku (初音ミク) is the first installment in the Vocaloid2 Character Vocal Series released on August 31, 2007. The name of the title and the character of the software was chosen by combining Hatsu (初 ,First), Ne (音 ,Sound), and Miku (未来 ,Future). The data for the voice was created by actually sampling the voice of Saki Fujita, a Japanese voice actress. Unlike general purpose speech synthesizers, the software is tuned to create J-pop songs commonly heard in anime, but it is possible to create songs from other genres. (Wiki)
Hatsune Miku is a 16-year-old girl with long green pigtails and a voice with a range no human could ever hope to match. She is a virtual singer with a computer-synthesized voice, a work by creators who met on the Internet. Many of the songs she sang have proven to be so appealing that the music industry cannot ignore her. She has developed into a singer with a large worldwide following. Lets now see who Mikus creators are and how her world was formed.
[via Japan Probe]
Some people are obsessed about her 😛