Vocaloids are computer programs that can sing by synthesizing human-like voices. They use a database of recorded vocal sounds to create melodies and lyrics, allowing users to produce songs without needing a real singer. Popular Vocaloids, like Hatsune Miku, have gained massive followings and are often featured in music videos and live performances as virtual characters. These digital singers are widely used in various music genres, from pop to electronic. Fans and creators can customize their Vocaloids, giving them unique personalities and styles. This innovative technology has transformed the music industry, enabling anyone to become a music producer with just a computer.