Diff checkers are used to scan code, text, string, etc and identify differences between two different versions of code, text, string, sectors of data, or files. Diff checkers are also used to identify any errors in data entry. Diff checkers are an important tool for identifying possible problems before they cause any issues.
When you are working in a team of people on the same document, it is very important that you don't commit mistakes. This is when diff checking comes into play.
We can compare two versions of the same files and see what has changed between them. If there are changes, we can decide which one we want to use by looking at the diff.