Microsoft Teams is an application that is part of Office 365. You can use it to communicate (chat, audio, video), access your business (team) data and connect to other Office 365 applications. In addition, you can connect to all kinds of external (cloud) applications such as, for example: Trello, Asana, CRM, PowerBI, Jira, etc. Microsoft Teams is thus a gathering place for your daily work, communication and collaboration with others.