What is Anonymous User?
An anonymous user is a visitor whose real identity is unknown to your analytics system. They are tracked using a randomly generated anonymous ID, typically stored in a cookie or local storage, which allows their activity to be grouped across pageviews and sessions.
Most analytics journeys start as anonymous. A user visits your site, and a unique anonymous ID is created for them. All their events and sessions are attributed to this anonymous ID until they identify themselves (by signing up, logging in, etc.).
Good analytics platforms handle the transition from anonymous to identified seamlessly, merging the anonymous user's historical data with their new identified profile — a process called identity resolution.
Example
A visitor lands on your blog from Google. They receive anonymous ID anon_a1b2c3. Over the next week, they visit 5 times and read 12 articles — all attributed to that anonymous ID. When they eventually sign up, their anonymous history is merged with their new user profile.
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