Question

Unique visitorsthe number of different people visiting a site during a specified time periodis the most reasonable measure of visits to a site. A new user is determined from the users registration with the site. Besides the address, page, and time, a website can find out the referring link address, which provides insight into which links people are taking to the site. Knowing which links bring people to the site can be helpful in planning online advertising. However, this method identifies visitors by their IP numbers, and many Internet service providers use a dynamic IP number, which is different every time a given user logs in through the service.

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