Most classes will be switching to using a new video conferencing and collaboration services called Zoom next semester.
But students, staff, and faculty can also use Zoom for meetings or group work as well!
If you go to illinois.zoom.us you have the option to host a meeting, which will allow you to invite others by sharing the Meeting ID, sending an email invite, or calling the person you wish to add to the meeting. Also at illinois.zoom.us, you have the option to join a meeting if you have been given a Meeting ID.