Why do kitchen gadgets appear on Facebook after looking up recipes online, or ads for running shoes pop up after searching for new training tips? How is it that the Internet seems to know so much about our interests? These kinds of experiences are due to the ubiquitous and much less tasty cousin of the chocolate chip cookie: the web cookie. This talk will cover the basic concepts behind cookies, the upside of how they can be beneficial to you, and the downside of how they're also used to track your web browsing habits to tailor marketing. Finally, suggestions will be provided for taking back some privacy and control. This talk is presented by Kay Avila, Sr. Security Engineer at NCSA. This presentation will be recorded.