People who join need no install and no sign-up: just open the link.
Create a meeting, copy the link and send it; the other person just opens it.
On a computer you can share your screen or one window and others see it instantly.
Draw together on a whiteboard, or mark up a shared screen.
Files go straight between browsers, never through the server.
What people say can be written down and downloaded afterwards (needs a browser with speech recognition).
Video and audio go directly between browsers first; a relay is used only when that fails.