What is a defining characteristic of "The Simpsons" in the context of animation history?

"The Simpsons" is defined as a groundbreaking show in the realm of animation primarily because it led the way for other adult animated series. As one of the first prime-time animated sitcoms aimed at an adult audience, it broke away from the traditional perception of animated shows being solely for children. The series introduced a blend of humor that mixed satire, social commentary, and character-driven storytelling, which appealed to adults and diversified the animation landscape.

Prior to "The Simpsons," animated programs were predominantly created for children, and its success demonstrated that there was a substantial audience for animation that catered to adult themes and humor. This paved the way for a variety of other adult animated series, such as "South Park," "Family Guy," and "Futurama," significantly influencing the genres of both animation and television comedy. The cultural impact of "The Simpsons" reshaped expectations and opened up new creative avenues for animators and storytellers in the industry.