U2 are a rock band from Dublin, Ireland. They formed in 1976 when the members were teenagers with limited musical proficiency. By the mid-1980s, however, the band had become a top international act, noted for their anthemic sound, Bono's impassioned vocals, and The Edge's textural guitar playing.

U2 have sold more than 170 million albums worldwide and have won more Grammy Awards than any other band. In 2005, the band were inducted into the Rock and Roll Hall of Fame in their first year of eligibility. Throughout their career, as a band and as individuals, they have campaigned for human rights and social justice causes, including Amnesty International, the ONE Campaign, and Bono's DATA (Debt, AIDS, Trade in Africa) campaign.

This introduction is taken from U2’s entry on Wikipedia where detailed information about the band members, and their history can be found.