Unique visitor

An individual person visiting a website.

A unique visitor is someone with a unique address who is entering a website for the first time that day (or some other specified period). Thus, a visitor that returns within the same day is not counted twice. A unique visitors count tells you how many different people there are in your audience during the time period, but not how much they used the site during the period. Because most websites can only identify a person’s computer (regardless of who is using it), there may be slight discrepancies between the number of individual people on a website and the number of unique visitors.