There are certain blog tracking sites that display recently published material from the web. They scan blogs on a regular basis to see if anything new has been published, but publishers can also actively notify these services of new material by sending them a "ping." A blog ping is a simple piece of XML text that contains your blog name and the URL.
I think that you have got your answer, But for your request, Ping is not like your command window ping signal, or http request, Its a simple method to used to send queries to Search bots.