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Our detailed dictionary of internet terms

Unique Visitors

A unique visitor is one that has not visited the site before in any given timeframe.

This means that over the course of this timeframe (say a month), a unique visitor may view the site 100 times, and view 1,500 pages, but they will only be counted as a unique visitor once.

After the timeframe resets (next month) they will be counted as a unique visitor again the next time they visit the site, but this will only happen once a month (or whatever the time period used).

These differ from pageview statistics where each page is counted, regardless of who is viewing it and where they have been before.