Answer:
content controls
Step-by-step explanation:
"Content Controls" are being used in Microsoft Word in order to provide individual controls which can be customized in forms, documents and templates. So, this helps the user identify the appropriate content for particular form fields. For example, when a user adds a content tool for a template, it will tell him where he can input the date and other specific information. The contents in the form field may also be changed or deleted according to "user restriction."
So, this explains the answer.