What feature in Word allows for real-time editing by multiple users?

The feature that enables real-time editing by multiple users in Word is co-authoring. This functionality allows several people to work on the same document simultaneously, making changes that can be viewed and edited by all collaborators in real-time. Co-authoring enhances teamwork and collaboration, especially in shared projects, as users can see each other's edits instantly, facilitating quicker updates and discussions about content.

In contrast, Track Changes is primarily used for tracking edits made to a document over time, allowing users to review and approve changes individually, rather than collaborating in real-time. Inserting comments is a feature that allows users to add feedback or notes within the document but does not facilitate simultaneous editing. Word Count simply provides a count of the number of words in the document and does not pertain to collaborative editing.