Green Day is an iconic American punk rock band that emerged in the late 1980s. Formed in 1986 in Berkeley, California, the band consists of lead vocalist and guitarist Billie Joe Armstrong, bassist Mike Dirnt, and drummer Tré Cool. With a sound characterised by catchy melodies, energetic guitar riffs, and socially conscious lyrics, Green Day gained widespread popularity with their breakthrough album "Dookie" in 1994. The album's success propelled them into the mainstream, and they became key figures in the punk rock revival of the mid-1990s. Known for their high-energy performances and rebellious spirit, Green Day has maintained relevance over the years, releasing numerous albums, including "American Idiot," which earned them Grammy Awards and further solidified their status as one of the most influential punk rock bands of their generation.