Batman is a superhero who appears in American comic books published by DC Comics. Batman was created by the artist Bob Kane and writer Bill Finger, and debuted in the 27th issue of the comic book Detective Comics on March 30, 1939. In the DC Universe, Batman is the alias of Bruce Wayne, a wealthy American playboy, philanthropist, and industrialist who resides in Gotham City. His origin story features him swearing vengeance against criminals after witnessing the murder of his parents, Thomas and Martha, as a child, a vendetta tempered by the ideal of justice. He trains himself physically and intellectually, crafts a bat-inspired persona, and monitors the Gotham streets at night. Kane, Finger, and other creators accompanied Batman with supporting characters, including his sidekicks Robin and Batgirl; allies Alfred Pennyworth and James Gordon; love interest Catwoman; and foes such as the Penguin, the Riddler, Two-Face, and his archenemy, the Joker.
Kane conceived Batman in early 1939 to capitalize on the popularity of Superman; although Kane frequently claimed sole creation credit, Finger substantially developed the concept from a generic superhero into something more bat-like. They drew inspiration from pulp fiction characters like the Shadow and Sherlock Holmes. Batman received a spin-off publication, Batman, in 1940. Kane and Finger introduced Batman as a ruthless vigilante who frequently killed or maimed criminals, but he evolved into a just, disciplined superhero with a stringent moral code that prohibits killing during the 1940s. Unlike most superheroes, Batman does not possess any superpowers, instead relying on his intellect, fighting skills, and wealth. The 1960s Batman television series used a camp aesthetic, which continued to be associated with Batman for years after it ended. Various creators worked to return Batman to his darker roots in the 1970s and 1980s, culminating with the 1986 miniseries The Dark Knight Returns by Frank Miller.
Batman's secret identity is Bruce Wayne, a wealthy American industrialist. As a child, Bruce witnessed the murder of his parents, Dr. Thomas Wayne and Martha Wayne, which ultimately led him to craft the Batman persona and seek justice against criminals. He resides on the outskirts of Gotham City in his personal residence, Wayne Manor. Wayne averts suspicion by acting the part of a superficial playboy idly living off his family's fortune and the profits of Wayne Enterprises, his inherited conglomerate. He supports philanthropic causes through his nonprofit Wayne Foundation, which in part addresses social issues encouraging crime as well as assisting victims of it, but is more widely known as a celebrity socialite. In public, he frequently appears in the company of high-status women, which encourages tabloid gossip while feigning near-drunkenness with consuming large quantities of disguised ginger ale since Wayne is actually a strict teetotaler to maintain his physical and mental prowess. Although Bruce Wayne leads an active romantic life, his vigilante activities as Batman account for most of his time.
Various modern stories have portrayed the extravagant, playboy image of Bruce Wayne as a facade. This is in contrast to the Post-Crisis Superman, whose Clark Kent persona is the true identity, while the Superman persona is the facade. In Batman Unmasked, a television documentary about the psychology of the character, behavioral scientist Benjamin Karney notes that Batman's personality is driven by Bruce Wayne's inherent humanity; that "Batman, for all its benefits and for all of the time Bruce Wayne devotes to it, is ultimately a tool for Bruce Wayne's efforts to make the world better". Bruce Wayne's principles include the desire to prevent future harm and a vow not to kill. Bruce Wayne believes that our actions define us, we fail for a reason, and anything is possible.