Microsoft Teams is a collaboration and video conferencing service that helps users keep in touch with one another and perform work-related tasks wtih service that allows you to communicate via text chat, voice or video call and also benefits from synergies with various other Microsoft 365 services, such as OneDrive and PowerPoint.
Microsoft Teams started out as a business application, Microsoft has recently been promoting the service as a consumer product too and, accordingly, has built it into the heart of Windows operating system.