why is ping necessary?

[jie9]

why do we have to ping our site/blog for every update or post we make ?

[C.Rebecca]

Pinging is important to accelerate the fresh spider crawling, so that SEs rank your pages, accordingly, for the updated content. It’s like alerting search engine, “Hey, I’ve added something new, come and take a look.”

[iPhoneapps]

Also pinging will help in indexing your post or webpage quickly otherwise it might took some time for crawlers to index that corresponding page .

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[paullopez]

It is not necessary to ping website or blog after each update. However, it is helpful if your blog posts are not getting indexed in search engines.

[mtrick]

ping is useful service to inform the search engine optimization about your latest posts or articles in blog.

[spiderswatch]

Pinging refers to :- When you ping your site then search engines gets a notification that your site has been updated and the site should be crawled.

[maggyparker]

IT can help to crawl your page faster by spiders. Well i don't think its necessary

[deepakg]

Pinging is basically method of knocking the SE to crawl the newly updated content at any website.So if there is any update to your website then it will tells the SE to crawl that fresh content.