Exact Match Domain EMD update was released on September 2012 to prevent poor or low quality website from ranking. Google also caught those sites who had search keywords in their domain names. And the web pages who has updated their content, those sites got good ranking. The update was announced by Matt Cutts on the 28th of September, and it’s been covered in some detail by Barry Schwartz.
It impacted on several businesses like: Retail, Gambling, Travel and Finance. On the other site it was beneficial for big businesses or competitors.