is sent by your browser (or router) to the site, so they know where to send the answer to. Depending on their software they can do with it what they want. And, yes, it's a nice way to find out where approximately you live.
And they know your browser and - if you clicked on a link somewhere to get into the site - where you came from.
When I enter a forum in which I am registered, does the webmaster (or anyone else for that matter)see the ip address of my pc? Do they know if I am connecting from this or that state or country? What specifically do they know? To what extent do I protect my privacy?Thanks.