What is Zoom?
Zoom is a cloud-based video communications app that allows you to set up virtual video and audio conferencing, webinars, live chats, screen-sharing, and other collaborative capabilities.
You don't need an account to attend a Zoom meeting, and the platform is compatible with Mac, Windows, Linux, iOS, and Android, meaning nearly anyone can access it.
What is Microsoft Teams?
Microsoft Teams is a Universal communication and collaboration platform that combines persistent workplace chat, video meetings, file storage (including collaboration of files), and application integration. The service integrates with the Office 365 subscription office productivity suite and features extensions that can integrate with non-Microsoft products.
Tips and tricks for using Zoom and Microsoft Teams can be found here