What is it?
It is a system for connecting people via the intenet which allows them to use video, audio, instant messaging, and desktop "sharing" to communicate one on one or in groups. Participants may record conferences.
How to get connected.
To use the Zoom system all participating users will need a Zoom account. These are free of charge for participants. Signing up may be done using your Google acount which, if you are already signed into Google on the computer, happens after you agree to allow Zoom access to Google profile information i.e. your Gmail address.
The system requires that you have some software on your computer/device. Responding to a meeting invitation will launch the installation proscess if you don't already have the application on your device. When you sign up for the Zoom account you will be provided with the correct software for your PC or Mac.
Lot more information can be found on the Zoom site
If you're using an IOS or Android device you get the application (still free) from the Store suitable for the device
Help for devices:
No Device?
You can still join a meeting by phone using one of the numbers found on this page. Most urban centers are included on the list which, usually, will mean it's a local call.
Problems?
Here's a page with some tips. Also there's lots of help available at the Zoom site.