1) Microsoft Teams is a chat-based workspace integrated with Office 365 that provides a single hub for collaborating in real-time on documents, chatting, and meeting online. 2) The document provides instructions on how to access and use basic functions in Microsoft Teams, such as sending messages, making audio/video calls, sharing screens, and participating in online classrooms. 3) Key functions covered include sending messages and files, creating channels for discussions, customizing Teams with apps, making and receiving audio/video calls, sharing screens, muting microphones, blurring backgrounds, and using chat during online classes.