Microsoft Stream is an Enterprise Video service where people in your organization can upload, view, and share videos securely. You can share recordings of classes, meetings, presentations, training sessions, or other videos that aid your team's collaboration.
Teams Live Events is an extension of Teams meetings, enabling you to produce events for large online audiences with more control over video, audience interaction, and reporting. This service is designed to host multiple presenters sharing information with larger audiences in a lecture-based format.