There is usually no difference between virtual meetings and online meetings! Online meeting is an old term, nowadays it is referred to as virtual meeting, but it is adding many new modern facilities.
Virtual meeting etiquette (aka virtual meeting manners) refers to the set of guidelines and practices that individuals should follow to ensure smooth and productive online meetings.
A virtual meeting is a meeting of people using digital technology to communicate and collaborate remotely without needing a physical presence in the same location.