Batman is an ongoing comic book series featuring the DC Comics hero of the same name. The character first appeared in Detective Comics #27, published in May 1939. Batman proved to be so popular that a self-titled ongoing comic book series began publication in the spring of 1940. It was first advertised in early April 1940, one month after the first appearance of his new sidekick, Robin, the Boy Wonder. Though the Batman comic book was initially launched as a quarterly publication, it later became a bi-monthly series through the late 1950s, after which it became a monthly publication and has remained so since. The initial run ended with issue #713.
The Batman saga takes place primarily in the fictional municipality of Gotham City, a city overrun with crime, graft, and corruption. Its citizens live in perpetual fear from the vast number of criminals, gangs and common thugs. In an effort to combat the cancerous infection of crime, billionaire philanthropist Bruce Wayne creates the costumed persona of the Batman to prey on the superstitous and cowardly criminals' fears. Wayne, a young socialite who witnessed his parents' murder during a mugging when he was a small child, used his trauma and vast personal wealth to travel the world and gain the skills needed to wage his war on crime. Batman utilizes his keen analytical mind and sophisticated technology and gadgetry, as well as outstanding physical agility, power and stamina to ensure that criminals never feel safe in Gotham, and are always afraid of the dark. In the eyes of the public, the Batman is believed to be both an urban legend and something more than human: an indeterminable black specter that represents terror. Wayne reasoned that fear was his weakness as a child, but as a man, it became his weapon.