What's the difference between the "commit" and "diff" tabs in cgit?

Question

I struggle to understand why the "diff" tab exists at all, since the entire content of diffstats seems to be already contained in every "commit" tab.

Answer 1

In the "commit" tab you see the diff between a commit's tree and its parent's tree. In the "diff" tab you can see the diff between arbitrary trees, for example a commit with its grand-grand-parent.