1. Needless to say, the Disney company founded by Disney, the founder of Mickey Mouse, not only makes cartoons, but also does everything.
2. Pixar, formerly known as "Industrial Light and Magic Company", was founded by george lucas, the director of Star Wars, and was later sold by george lucas to Steve Jobs, the founder of Apple, and was replaced by Pixar. There is a prohibition clause in the contract, which means that Pixar is not allowed to make non-animated films, so Pixar can only make cartoons.
DreamWorks is a company founded by Spielberg, not an animation company. It has nothing to do with the first two.
When Pixar was founded in the early days, it co-produced cartoons with Disney, that is, Disney paid, Pixar distributed technical talents to Disney, and then divided the money. However, in the middle of the cooperation, because Disney always wanted to control Pixar and divide the spoils unevenly, it broke up for a while, during which several cartoons of Pixar and Disney had ironic lines. For example, in Looking for Nemo, the overbearing fish father has the shadow of Disney.
In 2006, due to the depression of Disney's own animation department, Disney acquired Pixar and became the head of Disney's animation department. Jobs became one of the shareholders of Disney's head office.