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The Justice League (formerly known as the Justice League of America) is a fictional team of superheroes that appears in American comic books published by DC Comics. The team first appeared in The Brave and the Bold #28 (March 1960). The team was conceived by writer Gardner Fox as a revival of the Justice Society of America, a similar team from DC Comics from the 1940s which had been pulled out of print due to a decline in the popularity of superheroes.

The Justice League is an all-star ensemble cast of established superhero characters from DC Comics' portfolio. Diegetically, these superheroes usually operate independently but occasionally assemble as a team to tackle especially formidable villains. This in contrast to certain other superhero teams such as the X-Men, whose characters were created specifically to be part of their team, with the team being central to their identity. The cast of the Justice League usually features a few highly popular characters who have their own solo books, such as Superman, alongside a number of lesser-known characters who benefit from exposure, such as Cyborg. The Justice League was created to boost the profiles and sales of said characters through cross-promotion. A Superman fan might buy it because it has Superman in it, and perhaps in turn take an interest in Batman, who also appears as Superman's friend and comrade. The Justice League also helped develop the DC Universe as a shared universe as it is through teams like the Justice League that the setting's characters regularly interact with each other.

Beyond comic books, the Justice League has been adapted to a number of television shows, movies, and video games.