Microsoft Teams - Chat
This connects conversations based on people; therefore a chat between Person A and B will be it's own chat, whereas a chat with A, B, and C will be a separate chat.
Microsoft Teams - Creating a Team with Channels
A Team connects conversations based on topic. Individuals are added to the team where they can view and contribute to channels to group conversations. Chat is available to supplement the Team.
Microsoft Teams - Video Calls
For staff already using Teams (Chat and/or Team), there is an embedded web conferencing tool! This is a great alternative tool to Zoom as it is built into a platform you're already using and doesn't require a meeting URL when calling from a Chat.
This is also the student Zoom replacement tool due to the audio issue of Chromebooks not hearing audio when connected to a Zoom.