A unique visitor is a user identified as distinct in a website’s traffic statistics over a given period, usually a month. This identification relies primarily on the use of cookies or, less frequently, on IP addresses, which can lead to certain limitations, such as confusion between multiple users of the same device or the deletion of cookies. Therefore, the same user visiting a site multiple times will only be counted once as a unique visitor, while each visit is counted separately. The number of unique visitors is a key indicator for measuring a website’s popularity and audience.