Batman is one of the most popular superheroes, after Superman and possibly Spider-Man. The character was first introduced in Detective Comics #27 in 1939, and quickly got his own title. Originally portrayed as a dark avenger of justice, the character has gone through several changes over the course of his existence, at times being a more light-hearted superhero throughout the 1950's and early 60's, then being called the Dark Knight Detective through the next decade. More recently the character has gone back to his original concept of being a dark spectre of law enforcement, putting fear into the hearts of criminals across Gotham City.
In more recent years, Batman has again gained popularity, thanks to such films as Batman Begins and its sequel, The Dark Knight. A whole new generation of young fans has become enthralled by the character.