Nearly any website you visit asks you to accept cookies, and most of us don’t even think about this choice — we just click “yes” to rid ourselves from the pain of the pop-up. But what are we really agreeing to? What is a cookie, anyway? These small text files were first used in browsers back in 1994 and soon became ubiquitous. Cookies can be used for both productive and evil reasons, and I try to sort them out and show you how to avoid them.