Amongst the speculation and conjecture it can be difficult sometimes to really understand what Google have and haven’t changed about their algorithm. There are somethings though which we do know for sure, or at least almost.
These recent algorithm changes, we don’t know how recent, have been confirmed by staff at Google in theGoogle Policy Blog and so all SEO experts and webmasters should take note. To have got to the point where they are announced these aren’t going to be tweaks that Google are playing with but changes they have made a decision to keep long term.
This first change you can see with your own eyes, the snippets used in Google search results are going to be from more relevant parts of the page and not just the header. This is based on the fact that Google’s robots are getting better at identifying the main page content, partly based on what is unique we would assume rather than what is on every page of your site but also probably based on heading tags. To be successful at SEO you need to be good at getting your results to show high up in Google but also to make sure they are clicked on. In the past it was important to make sure you had a relevant meta description now it seems that the places where key phrases are found are more important; you may need to think more carefully about the words around a phrase and the context in which they are used.
Source: Affordable SEO Blog