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Understanding Cookies: Definition, Uses, and Drawbacks

Cookies, also known as web or HTTP cookies, are text files stored by a user's browser. They serve various functions such as authentication, saving site preferences, managing shopping cart contents, and remembering session identifiers. While cookies enhance user experience, they come with drawbacks such as undercounting users on shared computers, multiple devices leading to repeated counts, and user deletion of cookies which can falsely identify unique visitors. Learn more about the implications of cookie usage in web tracking.

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Understanding Cookies: Definition, Uses, and Drawbacks

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  1. Cookies

  2. What are Cookies? • A cookie, also known as a web cookie, browser cookie, and HTTP cookie, is a piece of text stored by a user's web browser. A cookie can be used for authentication, storing site preferences, shopping cart contents, the identifier for a server-based session, or anything else that can be accomplished through storing text data • The web server tracks session cookies (cookies for the page content) • The ad server tracks ad cookies (cookies for the displayed ad)

  3. Drawbacks of Cookies • Multiple computers • Each computer has a browser and each is counted (the same viewer can be counted twice) • Multiple users on same computer • If multiple people use the same computer (i.e. family with their home computer), the cookies will undercount those people and treat them as one • Cookie deletion • If you delete your cookies, it will count you as a different person each time (estimates are that 10%-30% cookie deletion)

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