The Flash is a fictional superhero appearing in comic books published by DC Comics. He is known for his incredible speed, which allows him to run at superhuman velocities, making him one of the fastest characters in the comic universe. The character first appeared in 1940 and has been portrayed by several individuals, with Barry Allen being the most recognized version. The Flash uses his speed not only for running but also for various abilities, such as time travel and creating speed force energy. He often battles villains like Reverse-Flash and Zoom, who challenge his abilities and moral values. The character has also been adapted into various television series and movies, further expanding his popularity.