Microsoft Teams is a collaboration platform that allows for secure chat, video calls, file sharing, and other features. It integrates with Office 365 applications and allows for external collaboration. Teams enforces security measures like two-factor authentication, single sign-on, and encryption of data at rest and in transit to securely store files in SharePoint and notes in OneNote. The platform can be used for collaboration within organizations as well as live events for up to 10,000 attendees over 4 hours.