Get started with Apps in Microsoft Teams - Microsoft Support
https://support.microsoft.com/en-us/office/get-started-with-apps-in-microsoft-teams-3479773b-2526-4473-804f-23d458c2aaca
WebApps helps you customize, simplify, and optimize how you work in Microsoft Teams to make collaboration more effective. Explore Apps in Teams to find apps, tools, and more that help you and your colleagues stay focused and organized. There are three main areas where you can add an app in Teams: Chat: to take action directly in a conversation.
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