Teams - Chat
Teams Chat provides a method to exchange instant messaging.
A direct chat allows you to message any one person, or a group of people.
Posting a message in a Channel, is a form of chat that all members of that Channel can access.
Teams - First things to know about chats in Microsoft Teams
Teams - First things to know about group chats in Microsoft Teams
Teams - First things to know about notifications in Microsoft Teams
Teams - Start a chat in Microsoft Teams (Desktop & Mobile)
Teams - Person to person and group Chat