Explanation:
Box 1: An Adaptive Card
Adaptive Cards is a card exchange format adopted by Composer that lets developers define their card content in a common and consistent way using JSON.
Adaptive Cards not only support custom text formatting; they also support the use of containers, speech, images, buttons, customizable backgrounds, user input controls for dates, numbers, text, and even customizable drop-down lists.
Box 2: an image
Reference:
https://docs.microsoft.com/en-us/microsoftteams/platform/task-modules-and-cards/cards/cards- reference
https://docs.microsoft.com/en-us/composer/how-to-send-cards?tabs=v1x