The Bronze age
After the 12-issue limited series Crisis on Infinite Earths, DC Comics retconned the histories of some major characters in an attempt at updating them for contemporary audiences. Frank Miller retold Batman's origin in the storyline "Year One" from Batman #404–407, which emphasizes a grittier tone in the character. Though the Earth-Two Batman is erased from history, many stories of Batman's Silver Age/Earth-One career (along with an amount of Golden Age ones) remain canonical in the post-Crisis universe, with his origins remaining the same in essence, despite alteration. For example, Gotham's police are mostly corrupt, setting up further need for Batman's existence. While Dick Grayson's past remains much the same, the history of Jason Todd, the second Robin, is altered, turning the boy into the orphan son of a petty crook, who tries to steal the tires from the Batmobile. Also removed is the guardian Phillip Wayne leaving young Bruce to be raised by Alfred Pennyworth. Additionally, Batman is no longer a founding member of the Justice League of America, although he becomes leader for a short time of a new incarnation of the team launched in 1987. To help fill in the revised backstory for Batman following Crisis, DC launched a new Batman title called Legends of the Dark Knight in 1989 and has published various miniseries and one-shot stories since then that largely take place during the "Year One" period. Various stories from Jeph Loeb and Matt Wagner also touch upon this era.
In 1988's "Batman: A Death in the Family" storyline from Batman #426–429 Jason Todd, the second Robin, is killed by the Joker. Subsequently Batman begins exhibiting an excessive, reckless approach to his crime-fighting, a result of the pain of losing Jason Todd. Batman works solo until the decade's close, when Tim Drake becomes the new Robin. In 2005, writers resurrected the Jason Todd character and have pitted him against his former mentor as the murderous vigilante the Red Hood.
Many of the major Batman storylines since the 1990s have been inter-title crossovers that run for a number of issues. In 1993, DC published both "The Death of Superman" storyline and "Knightfall" . In the Knightfall storyline's first phase, the new villain Bane paralyzes Batman, leading Wayne to ask Azrael to take on the role. After the end of "Knightfall," the storylines split in two directions, following both the Azrael-Batman's adventures, and Bruce Wayne's quest to become Batman once more. The story arcs realign in "KnightsEnd," as Azrael becomes increasingly violent and is defeated by a healed Bruce Wayne. Wayne hands the Batman mantle to Dick Grayson (then Nightwing) for an interim period, while Wayne trains to return to the role.
The 1994 company-wide crossover Zero Hour changes aspects of DC continuity again, including those of Batman. Noteworthy among these changes is that the general populace and the criminal element now considers Batman an urban legend rather than a known force. Similarly, the Waynes' killer is never caught or identified, effectively removing Joe Chill from the new continuity, rendering stories such as "Year Two" non-canon.
Source: en.wikipedia.org/wiki/Batman
In 1988's "Batman: A Death in the Family" storyline from Batman #426–429 Jason Todd, the second Robin, is killed by the Joker. Subsequently Batman begins exhibiting an excessive, reckless approach to his crime-fighting, a result of the pain of losing Jason Todd. Batman works solo until the decade's close, when Tim Drake becomes the new Robin. In 2005, writers resurrected the Jason Todd character and have pitted him against his former mentor as the murderous vigilante the Red Hood.
Many of the major Batman storylines since the 1990s have been inter-title crossovers that run for a number of issues. In 1993, DC published both "The Death of Superman" storyline and "Knightfall" . In the Knightfall storyline's first phase, the new villain Bane paralyzes Batman, leading Wayne to ask Azrael to take on the role. After the end of "Knightfall," the storylines split in two directions, following both the Azrael-Batman's adventures, and Bruce Wayne's quest to become Batman once more. The story arcs realign in "KnightsEnd," as Azrael becomes increasingly violent and is defeated by a healed Bruce Wayne. Wayne hands the Batman mantle to Dick Grayson (then Nightwing) for an interim period, while Wayne trains to return to the role.
The 1994 company-wide crossover Zero Hour changes aspects of DC continuity again, including those of Batman. Noteworthy among these changes is that the general populace and the criminal element now considers Batman an urban legend rather than a known force. Similarly, the Waynes' killer is never caught or identified, effectively removing Joe Chill from the new continuity, rendering stories such as "Year Two" non-canon.
Source: en.wikipedia.org/wiki/Batman