The Google AdWords Change.Late last week Google introduced a “quality based” bidding system intended to give advertisers more control of their campaigns while potentially improving ad relevance for users.This newest AdWords incarnation will no longer automatically disable words that generate a high number of impressions without achieving a corresponding minimum number of clicks.
Instead, Google will make these ads available to users, provided the advertiser meets bid requirements established by the system. By doing so, Google will open up a larger inventory of ads in addition to reviving ads formerly in the dark. For more on this visit here