Page Rank (PR) is a ranking system to measure a website's value on the web. Google Page Rank is the value of a website. Google time to time updates website's page rank but it is not a regular process. Page Rank toolbar updates site's ranking 3/4 times in a year and all website's page rank update at a time.
Recently Google has updated an algorithm named EMD (Exact Match Domain). This algo is to control that domain which is low-quality exact matched with its main keyword. On the Search Engine Result Page (SERP) EMD category domain will not show on 1st page. After the updates, already huge EMD domain lost their position on Search Engine Result Page (SERP).
Meta Description is an HTML attributes which is a short brief of your content on web page. Meta description is commonly used by search engines with search item and prewiew on search result page. Search engines take 150-160 characters with search items on a search result page from meta description.
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Google has just launched their penguin update to control web spamming. It is a data refresh and for those sites which are not following Google quality guideline and also penguin algorithm is focused on those sites that are breaking Google’s current excellent recommendations.
The update means quality blog or content owner have more visitors on their site. After penguin update, many bloggers lost their search position because of over optimizing. Google always likes your high quality and unique content.