Green Day is an American rock band formed in 1986, known for their energetic performances and catchy melodies. The band, consisting of Billie Joe Armstrong, Mike Dirnt, and Tré Cool, gained fame with their 1994 album Dookie, which brought punk rock into the mainstream. Over the years, Green Day has released several critically acclaimed albums, including American Idiot, which addressed political themes and social issues. Their music often combines punk rock with pop sensibilities, making them one of the most influential bands of their generation.