What exactly is Office365?

Office365 is the collective name for all Office-related applications.  These are tools you probably already use a lot today 👩‍💻 : Teams (all Teams channels, chat as well as telephony), Sharepoint, OneDrive, Yammer, Mail (outlook), Word, Excel, PowerPoint, OneNote, PowerBI, Stream, Planner, Project, Visio, MS Bookings...