Short answers, pulled from the story.
Led Zeppelin was formed in the summer of 1968 by Jimmy Page, Robert Plant, John Paul Jones, and John Bonham. The group initially played under the name the New Yardbirds before adopting their final identity following legal complications.
The name Led Zeppelin originated from a joke by The Who's Keith Moon about a supergroup going down like a lead balloon. Manager Peter Grant and Jimmy Page removed the 'a' from lead to prevent mispronunciation and replaced balloon with zeppelin to evoke both heaviness and grace.
Led Zeppelin IV was released on the 8th of November 1971 and sold 37 million copies worldwide. The album is officially untitled but features four symbols representing the four members and includes the iconic track Stairway to Heaven.
Led Zeppelin disbanded on the 25th of September 1980 after drummer John Bonham died from asphyxiation following a night of heavy drinking. The remaining members issued a statement confirming they could not continue without their friend and canceled their planned North American tour.
Led Zeppelin was inducted into the Rock and Roll Hall of Fame in 1995 and received a Grammy Lifetime Achievement Award in 2005. The band has sold over 200 million albums worldwide and their albums have been certified Diamond by the Recording Industry Association of America.