A unique visitor is a single user who visits a website during a specific time period, such as a day, week, or month. Each unique visitor is counted only once during that period, regardless of how often they visit the site. This metric helps website owners understand the size of their audience.
For example, with Pirsch Analytics, a website visited multiple times in a day by the same user is still counted as a single visitor. This distinction is important to measure true reach, not just the level of activity reflected in metrics such as page views or sessions.
