Have you ever wondered where that little snippet (description or excerpt from a webpage) of text comes from that describes each search result in Google?
Well, if you have, there’s good news and bad news about it:
1) The good news is that there is an answer. (Whew!)
2) The bad news is that it’s not as simple as one might hope.
The short answer is that it comes from multiple sources, either on the web page itself, or in certain circumstances, even from other pages (such as the Open Directory Project, also known as dmoz.org).
If you want to know more about this snippet, as well as everything you see in a search result, including page title, page description, and sitelinks, including additional elements that may appear, such as stock quotes, cached pages links, and more, then you’ll want to check out this 8 min video from Google entitled, The Anatomy of a Search Result.
Here is more info from Google’s Search Engine Optimization
Description meta tags are important because Google might use them as snippets for your pages. Note that we say “might” because Google may choose to use a relevant section of your page’s visible text if it does a good job of matching up with a user’s query. Alternatively, Google might use your site’s description in the Open Directory Project if your site is listed there (learn how to prevent search engines from displaying ODP data). Adding description meta tags to each of your pages is always a good practice in case Google cannot find a good selection of text to use in the snippet.