"Blog and Ping" is a term that refers to a technique where you make a post on your blog, and using your blog software's in-built feature, you then send out a "Google Search Ping 195 Sites" to various blog directories, notifying them that you have added a new post to your blog.

A "ping" is a way of notifying various blog directories and blog search engines, in an industry standard way, that you have just made a post on your blog. This is nothing but a signal sent from your blog (pinger) to the target directory (or aggregator service) that you are actually pinging (the pingee), and this signal contains the URL of your post. Following this, the pingee picks up the URL and content from your post, and when someone on that site searches for keywords contained in your post, then your post shows up in their search results.

Search engines (especially Google) love blogs, because blogs are full of "useful" content (at least they are supposed to be).

In November 2006, I personally noticed one of my main sites suddenly drop a few places from position #2 to #8 in Google's SERP (search engine results pages). Now Google sends me about 80% of my total traffic to this site, and as soon as my site dropped to #8, it went "below the fold" (meaning, out of the view of the first part of the results page that appears when you do a search, and the only way to see it is to scroll down a little). And I immediately saw my AdSense earnings drop about 80%!