What is a unique visitor?

There isn't one - GoloLink counts clicks, not deduplicated people.

GoloLink doesn't have a "unique visitor" metric. There's no cookie, session, or identity used to recognize the same person across multiple clicks - every click is logged and counted on its own.

So if one person clicks your link three times, that's three clicks in your analytics, not one visitor. Where the dashboard shows a "Views" toggle (for Smart Pick page impressions), that's a raw view count with the same caveat - not deduplicated visitors either.