A way to measure a user’s unique identity. This measure uses deduction or inference based on a rule or algorithm which is valid for that server. For example, the combination of IP addressIP addressAn IP address is the numerical address assigned to each computer on the…//read more  and user agent can be used to identify a user in some cases. If a server receives a new request from the same client within 30 minutes, it is inferred that a new request comes from the same user and the time since the last page requestPage requestThe opportunity for an HTML document to appear on a browser window as a direct…//read more  was spent viewing the last pagePageA document having a specific URL and comprised of a set of associated files. A…//read more . Also referred to as an inference.