A ping is sort of an electronic messenger that goes out to the world and says, "Hey, I'm here and I've just changed so come on by and check me out." They inform feed aggregator sites to know that something has just happened at a blog. But more than just a classical blog can be pinged. Any page that has an RSS feed can be pinged. And, pinging the RSS feed from your blog lets subscribers to your feed know that your blog has changed so they can check it out.
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