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 for HTTP cookie
From The Free On-line Dictionary of Computing (18 March 2015) :

  HTTP cookie
  computer cookie
      A small string of information sent by a web
     server to a web browser that will be sent back by the browser
     each time it accesses that server.
     Cookies were invented by Netscape to make it easier to maintain
     state between HTTP transactions.  They can contain any
     arbitrary information the server chooses to put in them.
     The most common use of cookies is to identify and authenticate a
     user who has logged in to a website, so they don't have to sign
     in every time they visit.  Other example uses are maintaining a
     shopping basket of goods you have selected to purchase during a
     session at an online shop or site personalisation (presenting
     different pages to different users).
     The browser limits the size of each cookie and the number each
     server can store.  This prevents a malicious site consuming lots
     of disk space on the user's computer.  The only information that
     cookies can return to the server is what that server previously
     sent out.
     The main privacy concern is that it is not obvious when a site is
     using cookies or what for.  Even if you don't log in or supply any
     personal information to a site, it can still assign you a unique
     identifier and store it in a "tracking cookie".  This can then be
     used to track every page you ever visit on the site.  However,
     since it is possible to do the same thing without cookies, the UK
     law requiring sites to declare their use of cookies makes little
     sense and has been widely ignored.
     After using a shared computer, e.g. in an Internet cafe, you
     should remove all cookies to prevent the browser identifying
     the next user as you if they happen to visit the same sites.
     http://cookiecentral.com/c_concept.htm)">Cookie Central (http://cookiecentral.com/c_concept.htm).
     Stupid cookie law

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