What defines a "User"?

I'm pretty confused on what defines a "User" in Smartsheet.

When I go to User Management section I can see a list of my users, currently 18.

I know however that there are probably 60 people in my organization that sheets are shared to and they have edit permissions on those sheets.

Why don't they appear as users?

Where would they alternately be listed?

I can't imagine that there is no way of tracking who is accessing each sheet without having to go sheet by sheet.

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