title: How does Google know that I am still logged in?
body: <p>I am trying to learn more about Google and other sites, and would like to know whether i got this right or not. So here it goes:</p>
  
  <p>When I log into my Google account (or any other site like Twitter or Facebook) then I start a new session. That means that the server knows that I logged in and sets an expiration time for that session. So when I close my browser (and not log out) and my session is not expired yet, then I can open up a new browser window and will be still logged in. Is that correct?</p>
  
  <p>Ok, what I would like to know is, are there any files stored on my computer during this process of logging in? Like cookies? Or are they only stored when I tick the box "stay signed in"?</p>