Final answer:
A preformatted document in Word 2016 used as a starting point is called a template, which provides a pre-set structure for efficiency and consistency in document creation.
Step-by-step explanation:
A preformatted document used as a starting point in Word 2016 is known as a template. Templates are designed to provide a consistent structure and style, allowing users to create documents more efficiently by avoiding repetitive formatting tasks. When using a template, you can start with a set of predefined settings like margins, fonts, and layouts, which can be customized as needed for your particular document.
Options like SmartArt, a placeholder, and interactive media are different features within Word. SmartArt is a tool for creating diagrams, placeholders are areas in a document that can be filled with text or other content, and interactive media refers to elements like videos or forms that can be interacted with by the user.