The plugin counts the number of the site visitors during the day. If the same user visits the site 5 times during the day, the plugin sees 5 visits, but not one. The visit means that a user enters the site or console as a guest user or bot, and stays within the time set on the plugin settings page (The time period when the user is online, without making any actions).
This article related to Visitors Online plugin
Additional resources: Visitors Online - User Guide
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