The Golden Age of comics was a period where comics publications flourished in popularity, both in newspaper strip format and in comic magazines. New superhero characters sprung up weekly, and children struggling through the hardships of the Great Depression and World War II ate them up.
Escapism was the focus of these fantastic tales, but also propaganda. Comics afforded a unique opportunity for the US government to keep the young public hopeful while their fathers were serving overseas. Advertisements for war bonds appeared throughout most of the wartime comics. Villains, even of the supervillain variety, usually had ties to Nazi Germany or Imperial Japan. And superheroes such as Captain America captivated the imagination while selling the idea of American heroism and perserverence.
While the Golden Age saw the invention of a multitude of superheroes, comic books didn't achieve depth and iconic status until the Silver Age. This was a period where comics characters were solidified and carefully written, and where artists refined their styles to a point where the artists became as popular as their characters.
Many of the most famous comics characters today were either created or reenvisioned during the Silver Age. At Marvel Comics, Stan Lee and his main artist Jack Kirby resurrected and repurposed Kirby's 1940s-era character Captain America, while also creating The Fantastic Four, the Avengers, Iron Man, Thor, the X-Men, and the Incredible Hulk. Lee and revered artist Steve Ditko, meanwhile, created Spider-Man and Doctor Strange.
Marvel's competitor DC had a whole lineup of characters that had originated during the Golden Age which were now finding new audiences and more interesting stories. Superman, Batman, Wonder Woman, the Flash, and Green Lantern were reimagined and placed into culturally relevant situations throughout the social upheaval of the 1960s.
Comics had become cemented as a medium for the ages.
Marvel and DC saw changes in their staff as artists and writers departed to become freelancers during the Bronze Age. A new generation of artists and writers sprang up under the tuteledge of the previous decade's writers, now editors, to bring their superheroes to an audience that had grown accustomed to greater complexity.
By the mid-1980s, independent publishing companies sprang up with enough sales to stand as competitors to the Marvel/DC powerhouse. Graphic novels started to develop and find more adult audiences. Moral ambiguity and violence became major themes in comics. A sense of grittiness and edginess had found its way into what once was considered a medium only reserved for children.
Comics today run a gamut of subjects, from superhero mainstay titles to more adult-oriented comics. A ratings system has been developed to ensure small children aren't subject to some of the more extreme content in comics and graphic novels. This said, it's important to note that mainstream comics are still largely geared to general audiences, albeit with a target audience of pre-teens and teens.
Modern comics don't fit neatly into any box. There are comics for all types of readers -- educational comics, classical adaptations, original mature graphic novels, superhero adventures, family dramas, mystery and suspense thrillers, and gut-busting comedies.
Comics have found success in the movies, which has brought more attention and new generations of readers to the medium that started it all.