Ping

I'm a user of computers. That means I don't know shit about what is going on behind the screen I see, and I would like to keep it that way. However, this ping thing I would like to know more about. I know that at least one of my readers have ping on me, since I can see that one reader always goes on my blog as soon as I posted an item. Can this reader please tell me how you do? I would like to recommend that to others...and increase my visit stats :)