What Is Text Diff and How Does It Work? A Plain-English Explanation

The word 'diff' comes from the Unix command-line tool that's been comparing files since the 1970s. Today, text diff is used everywhere: code review systems, document editors, translation tools, and content management platforms all use diffing to show what changed between versions. But many people — including developers — don't fully understand how diff algorithms work or when to use a browser-based text diff tool versus other options. WikiPlus Text Diff at wikiplus.co makes the technology accessible to everyone, running entirely in your browser with no data uploaded to a server. This guide explains the concept clearly and helps you decide when WikiPlus Text Diff is the right tool for your comparison task.