COOKIES (NOT THE KIND YOU EAT)

Cookies are containers in the web browser for stringified data. A server can respond to an HTTP request by sending sending cookies using the Set-Cookie header. The cookie name acts as a key while the stringified data is the value. The web browser that stores the cookies it receives must also send the cookie back with a HTTP request until the cookie expires. You can overwrite cookies by setting a cookie name to one that already exists in your browser.