Cookies are little bits of information (in the form of a name and value pair, such as "name", "Jane Doe") that are transferred between your browser and the website you're visiting. These cookies are used for all sorts of things on the internet, like keeping track of who you are, whether you've logged in, and things in your shopping cart on [insert shopping website here]. Cookies are stored either temporarily (until you close your browser) or persisted (until some time set for each cookie). Cookies that are persisted are stored on your computer's hard drive (or solid state drive, or usb drive, or whatever you use for browser storage). The information stored is relatively small, less than most text files.