Megadeth is an American heavy metal band formed in 1983 by guitarist Dave Mustaine after his departure from Metallica. Known for their complex guitar work and fast-paced music, they are considered one of the "big four" of thrash metal, alongside Metallica, Slayer, and Anthrax. The band's lyrics often explore themes of politics, war, and personal struggles. Over the years, Megadeth has released numerous albums, with notable works including "Rust in Peace" and "Countdown to Extinction." The band has received several awards, including Grammy nominations, and has a dedicated fan base worldwide. Their influence on the heavy metal genre is significant and enduring.