Pingoat is a service that pings or notifies a number of services that keep track of weblogs and publish them. By pinging, you let the services know that your blog has been updated and hence, they crawl and index your site, publishing your blog contents, thus increasing your blog's popularity.
A 'Ping' is a basic Internet program that lets you verify that a particular Internet address exists and can accept requests. The verb ping means the act of using the ping utility or command.
Pinging in the blog world means different, but still similar. There are certain services that scans blog regulary for updates and publishes the recently updated blogs (for an example). So once you've updated your blog, you should let such a service know that you have your blog has peen updated. for this, you send a PING to the service. Most of the blog software have the ability to ping on their own. But pinging a dozen such services could be time consuming.
A blog ping is just a piece of text, in simple words. It'll contain your blog name and the url. It is usually prepared in the XML format. The servers that accept ping have special programs for accepting and processing these 'XML pings'.