Microsoft Teams is a collaboration app that helps your team stay organized and have conversations, all in one place. With Microsoft Teams on your PC, Mac, or mobile device, you can:
Pull together a team.
Use chat instead of email.
Securely edit files at the same time.
See likes, @mentions, and replies with just a single tap.
Customize it by adding notes, web sites, and apps.
Download Teams for your desktop, iOS, or Android.
Or just use Teams on the web at https://teams.microsoft.com.
Microsoft Teams help
Microsoft Teams Quick Start