Your web browser (Internet Explorer, Google Chrome, Mozilla Firefox, etc.) leaves traces about the web sites you have visited and also stores your preferences and login data on some sites, so you don't have to login each time you visit a certain website (such as your web based email). This information is stored in places that are difficult to determine and this is know as browser cookies.
east-tec Eraser helps you delete cookies, by automatically determining their location and wiping it securely.