Definition: Any program which compares two files or sets of files and outputs a description of the differences between them.

Alright class, settle down, let’s take a look, At “diffs,” a term that needs to be hooked! The dictionary gives you a clever phrase, “Comparing files in countless ways.” Let's break it down with a little rhyme, To make this concept truly sublime. "Diffs" means difference, you see, It shows what’s changed for you and me. Think of two versions of a story told, One is older, one fresh and bold. A "diff" program then takes the stage, And highlights changes on every page! It points out additions, deletions too, Showing exactly what's new or untrue. It compares sets of files, that’s quite the task, And gives a clear description – no need to ask! So remember this, and don’t you fret, "Diffs" are about changes you can detect! Do you have any questions? Let's discuss with glee, Now who can tell me what "diffs" might be?