Diff
A side-by-side comparison showing exactly what changed between two versions of a file, with additions highlighted in green and deletions in red.
A diff (short for “difference”) is a line-by-line comparison between two versions of a file, showing exactly what was added, removed, or changed. In tools like Git, added lines are marked with + and removed lines with -, making it easy to review changes before saving them. Diffs are the foundation of code review, debugging, and understanding what happened between any two points in a project’s history.
The Simple Version
Imagine comparing two drafts of an essay. A diff is like someone highlighting every sentence you added in green and every sentence you removed in red, so you can instantly see what changed without reading both versions front to back.
In code, diffs show exactly which lines were added, removed, or modified between two versions of a file.
Why It Matters
When you’re reviewing changes before committing them or trying to understand why something broke, diffs are invaluable. Instead of guessing what changed, you can see the exact lines that were modified. This makes code review faster, debugging easier, and collaboration safer.
How It’s Used on This Site
Before every commit, the changes are reviewed as diffs in Cursor. This makes it easy to verify that only the intended changes are being saved, and nothing was accidentally modified.
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