A small text file stored on a client machine
that may later be retrieved by a web server from the machine. Cookies allow web servers to keep track of
the end user’s browser activities, and connect individual web requests into a
session. Cookies can also be used to
prevent users from having to be authorized for every password protected page
they access during a session by recording that they have successfully supplied
their user name and password already. Cookies may be referred to as
"first-party" (if they are placed by the website that is visited) or
"third-party" (if they are placed by a party other than the visited
website). Additionally, they may be referred to as "session cookies"
if they are deleted when a session ends, or "persistent cookies" if
they remain longer.