How to Compare Two Versions of a Document in Word 2013
Word compares the two documents and notes all changes. Then it displays a list of changes. You see the compared document with changes marked, plus the original and revised documents.
Look it over! Peruse the changes made to your pristine prose by the barbarian interlopers; use the Reviewing pane to witness each change individually. You can click a change in the Reviewing pane to quickly see which part of your document was folded, spindled, or mutilated.