When Do You Need a Diff?

You changed some code and aren't sure exactly what you touched. Someone sent back a revised document and you want to know what they changed. Two API responses look the same but something's off. A diff tool compares two blocks of text line by line and highlights what was added, removed, or changed — so you see the differences instantly instead of scanning line by line.

Common Use Cases

Code review — see exactly what changed at a glance
Document versioning — which clauses were updated in the contract
API response debugging — spot the field that changed between two calls
Config comparison — diff your dev and prod config files