What is a difference between Design and Prototype in Adobe XD?

Design

In very simplified model, design is used to define how things should look. It is very helpful for communicating key application-related information among business people, user interface designers, developers, testers and other involved parties.

Design:

• Defines the layout of screens of your application
• Defines look and feel of the elements on each screen
• Can have low fidelity (wireframe) or high fidelity (mockup)
• Simplifies communiction a lot because without having it, everyone has different image of what is to be built in his mind.
• Allows to get both business people and technical people to the same page

Prototype

Prototype is used to show how things should behave.

Prototype:

• Shows what happens in the application/design depending on different user interactions.
• Can be used by business users to test the usability of the application before the development has even started
• Helps back-end and front-end developers to understand how exactly the application should behave.
• Helps testers to understand behavioral details about the application so they can test it better.