A Visit (or View) means that someone visited your Lnk.Bio profile. So, every time someone clicks on your Instagram Biography and they land on Lnk.Bio, that's 1 view/visit.
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A Click means that someone clicked on one of the links you have added to your Lnk.Bio profile.
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So let's say I click on your IG bio, land on your Lnk.Bio profile, then click on your Facebook Icon and on your Twitter Icon, that's 1 visit and 2 clicks.