What Visitor is: a measure of unique visitors who have viewed your page, site, or ad.
What Visitor is not: a measure of how many times your page, site, or ad has been viewed. (One visitor may view a page many times.)
Why we care about Visitor: The number of visitors to your page, site, or ad is an important metric to know when you’re calculating things like bounce rate.
This post is part of an ongoing Clickipedia series, defining all the terms you need to know for conversion rate optimization. Keep checking back each week to learn more, and don’t forget to check out the whole series.