When using Word track changes and comments when collaborating on Word documents. Track changes in Word to ensure error-free files.
When you need to collaborate on the content of a document or if you need someone to proofread your document, Word's Track Changes and Comments features make it easier for you to collaborate with others.
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When you turn on the Track Changes option, all changes you make to the document show up as colored markups. If you delete some text, it won't disappear but instead will have a visible strike through it. If you add text, it will be underlined. This allows another person to see which changes have been made before making the changes permanent.
The color of the markups will vary depending on who is reviewing the document, so if there are multiple reviewers you'll be able to tell at a glance who made each change.
Sometimes instead of changing something, you may want to make a comment about part of the document. Comments show up in balloons in the right margin and can be read by the original author or by any other reviewers.