So Aristotle emphasized the process of human beings using materials to create what they imagined in their minds.
So he actually broadened Plato's artistic concept and defined it more accurately.
Furthermore, art, as a creative activity, must follow certain laws and have certain knowledge. He believes that art has three elements: talent, knowledge and skilled skills acquired through practice. These all contain Plato's definition of art, so the classic example, shoemaker making shoes is also art, still holds.
The biggest difference between him and Plato is whether poetry is an art or not. Plato thinks that poetry is not an art because it comes from the poet's madness, while Aristotle thinks that poetry is also an art because it has to abide by many laws, and it is also a science (poetics), which requires practice to acquire skills and talents. Poetry is still an imitation of reality, so poetry is an imitation art. As for Plato's saying that poetry originates from fanaticism, Aristotle thinks that it is not fanaticism, but belongs to the poet's talent.
In the following centuries, the definition of art basically followed the definition of Aristotle.