Characterization: Automorphisms of $\mathbb{A}_{\mathbb{C}}^n$

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Is there any sort of characterization(/research?) of automorphisms (of varieties) on $\mathbb{A}_{\mathbb{C}}^n$?

(The question came up, as we had to find a "non-trivial" automorphism on $\mathbb{A}_{\mathbb{C}}^2$, so I was wondering about this.)