Final answer:
When a watched document is updated, edits typically appear in red or with a red strikethrough for deletions, and you may receive notifications through email or the app.
Step-by-step explanation:
When a document is being "watched" for updates, you can typically be notified of changes through the document management system or collaboration tool you are using. If an edit is made, the changes might appear in a different color, often red, to indicate new additions, and deletions may be shown with red text with a strikethrough. This visual differentiation allows you to quickly see what content has been altered since you last viewed the document.
In some cases, depending on the settings and the platform, you may also receive an email or in-app notification alerting you to the fact that changes have been made to the document you are watching. Additionally, many document collaboration tools come with a version history feature, allowing you to view and compare previous versions of the document to understand what updates have been made.