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Ping submission is just used for indexing. There are lots of ping site available in the market. Ping sites send ping to different search engines about the website update. So when you have any update in website or blog and you want to crawl that update then you need to do ping submissions.
Ping mechanism is actually a mechanism to speed up the process of indexing your website, by pinging a signal so that search engines recognize you have published new content on the website, then the search engine will proceed to collect The new information.