what is Vocaloid?

This information is obviously for those who don´t know what Vocaloid is or for those who want to learn more about it. Here we go :3 :

Vocaloid is a voice synthesizer sofware developed through a joint research project between the Pompeu Fabra University in Spain and Yamaha Corporation, who backed it financially.
The software enables users to synthesize singing by typing in lyrics and melody. It uses synthesizing technology with specially recorded vocals of voice actors or singers. A piano roll type interface is used to input the melody and the lyrics can be entered on each note. The software can change the stress of the pronunciations, add effects such as vibrato, or change the dynamics and tone of the voice. Each Vocaloid is sold as "a singer in a box" designed to act as a replacement for an actual singer.