Final answer:
Word Online automatically saves documents to Microsoft's cloud storage service, OneDrive, which allows access to the most updated version of a document. You must be signed in to your Microsoft account, and you can accept or reject document changes through the Review tab in Word.
Step-by-step explanation:
When working with Word online, your document will be automatically saved to OneDrive. OneDrive is a cloud storage service provided by Microsoft that ensures any changes made to the document are saved in real-time, meaning you'll always have the latest version of your document. It's important to note that you must be signed in to your Microsoft account to take advantage of the autosave feature.
To manage document changes and revisions in Microsoft Word, use the Review tab in the Word interface. This tab allows you to accept or reject changes that have been made to the document, which is useful when collaborating with others.