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A before-and-after view of exactly what changed in files.
A diff is the basic proof artifact for code review. It shows added, removed, and modified lines so you can inspect what an agent or teammate actually changed instead of trusting a summary.
Plainly
Think of Diff as a tool from the builder toolbox. A before-and-after view of exactly what changed in files.
In practice
Use it when you are installing, editing, testing, reviewing, or shipping code. In practice, define the owner, input, output, and failure mode before you rely on it.