As far as I could understand, you'd like to know what's the difference between internal and external members in Trello, is it correct?
If yes, I'd imagine you're referring to "guest users" who are invited through a shareable link. Invited users have their access restricted to one specific board only (to the one they were invited to). Feel free to check more info about it and how to disable special links here.
So you’re using Trello at work, at home and to track your new DIY crafts. The family and co-workers are all on board and everything is organized, color coded and has a due date. But still, there’s so...
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