What chair stand for and how to use it ?

I cannot find any explanation about "chair" and "group" in lightning, when to use them, and what difference there is between chair and required or optional attendee.
Moreover if I send an appointment to a list, do I have to use chair and individual or optional attendee and group ?
Thanks

"Chair" means the owner or chairman (political correctness requires we say "chair" because "chairman" is apparently sexist, and "chairperson" annoys some people) of the meeting. There doesn't need to be one, I think; I can't ever recall using "chair" when issuing invitations. If it's ''your ''meeting then maybe you are the "chair". ;-)
"Group" probably means a Mailing List; a pre-built and ready-to use list of email contacts. I use these for project members at work, and for family at home. You can create these Mailing Lists in your Address Book.
In a business meeting, there may be particular experts or specialists who need to be there for the meeting to have any useful outcome, so they are "required". There may be others for whom it would be useful to attend the meeting but their absence wouldn't prevent the meeting being successful. They are "optional".
All rather a lot of overkill for informal appointments between friends or family. ;-)

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