
Explanation
Table Description automatically generated

Box 1: A task module
Task modules are modals that you can populate with either an Adaptive Card or an embedded web/content page for use in your custom Microsoft Teams app's user experience for workflows that require data input.
Task modules allow you to gather information in a Teams-aware popup.
Box 2: Adaptive cards
Adaptive Card tabs are a new way to build tabs in Teams. Instead of embedding web content in an IFrame, you can render Adaptive Cards to a tab. While the front end is rendered with Adaptive Cards, the backend is powered by a bot. The bot is responsible for accepting requests and responding appropriately with the Adaptive Card that is rendered.
You can build your tabs with relevant user interface (UI) building blocks native on desktop, web, and mobile.
Reference:
https://docs.microsoft.com/en-us/learn/modules/msteams-task-modules/