Microsoft 365 Teams

Microsoft Teams is your hub for teamwork in Office 365. All your team conversations, files, meetings, and apps live together in a single shared workspace, and you can take it with you on your favourite mobile device.

https://www.microsoft.com/en-au/microsoft-365/microsoft-teams/group-chat-software

With the advent of COVID-19 Microsoft released a free version of Teams. Whether you are a current 365 subscriber or not, everyone has access to Teams. Microsoft offer a free version of Teams for schools.

Looking for an alternative to Zoom, have a look at Teams.