Most of the G Suite users or even regular Gmail users knew how to invite others to join the ongoing Hangouts Meeting.
But in this article here we are talking about a new feature that available for all G Suite users.
Google developers now have added a new way to invite people to an ongoing meeting withing a Hangouts meet. When you are already in the meet, at the top of the participant list, you will see one tab “Add people.”
Check out below picture that will clarify your doubts:
After clicking “Add people,” will open another dialogue box to send invitation mail to join as a participant in Hangout meeting. You need to put a participant’s email address. Further, invited people will receive a unique link to join a session.
On the other hand, there is an added choice, to invite people through a phone call. In this case, the participant will only hear and will not see any screen share video.
Source: G Suite Updates