DIFF or diff may refer to:

• diff utility, a file comparison tool
• Data comparison, methods and implementations to compare texts or files
• Dominican International Film Festival
• Dubai International Film Festival
• Dharamshala International Film Festival

In computing, the diff utility is a data comparison tool that calculates and displays the differences between two files. Unlike edit distance notions used for other purposes, diff is line-oriented rather than character-oriented, but it is like Levenshtein distance in that it tries to determine the smallest set of deletions and insertions to create one file from the other. The diff command displays the changes made in a standard format, such that both humans and machines can understand the changes and apply them: given one file and the changes, the other file can be created.

Difference or differences may refer to::

• Difference (philosophy), a key concept in continental philosophy
• Difference (mathematics), a statement about the relative size or order of two objects
  • The result of arithmetic subtraction
  • Difference (set theory)
• Difference (computer science), a concept in computer science
• Difference (heraldry), any systematic way of distinguishing similar coats of arms belonging to members of the same family
• "Differences" (song), by Ginuwine
• Difference (album), a 2005 power metal album by Dreamtale