The Adaptive Card node allows you to use the Adaptive cards designed/built in the Experience Manager.
You can create a new card at Experience Manager > Project > Side menu > Components > Adaptive Cards. Refer to Adaptive Cards documentation.
Name - This is the display name for the node in Experience Designer (optional).
Adaptive Cards - A dropdown list of all the adaptive cards created in the project.
After selecting an adaptive card from the dropdown list, you can see its preview.
Adaptive Cards JSON - The JSON structure of the selected card.