After years of falling behind DC, The Fantastic Four helped propel Marvel Comics into their position of dominance in the comic book industry. Created in 1961, the team came to represent the pinnacle of Silver Age creativity, the team-up of Stan Lee and Jack Kirby and the Marvel Method. Made up of Reed Richards, Johnny and Sue Storm and Ben Grimm, the FF brought a relatable aspect to superheroes.
Source:https://www.cbr.com/fantastic-four-most-important-comic-lore-new-readers/