Microsoft Teams is a collaboration tool to help you communicate and share files with groups of people. Teams is the replacement for Skype for Business, which Microsoft is retiring on July 31, 2021. A few of the features are:
Chat
Meet
Call
Collaborate
Screen Sharing
Microsoft Teams Training https://www.youtube.com/playlist?list=PLXPr7gfUMmKzR7_jXN5s886apYoHNC3Xk
You can download the teams app here: https://www.microsoft.com/en-us/microsoft-teams/download-app