Google have decided that sites that copy content from other sites will be ranked lower than sites that offer original content AND that they will put more weight on how users interact with a site.
Time that people spend on your page has always been a ranking factor but it looks like the mighty Google will be placing even more importance on it. If Google does decide to rank a page highly and send traffic to it, they will only continue to send traffic if the content is good enough for visitors to hang around a while.
So if you want to rank highly in Google, your site really needs to offer good value content that encourages visitors to spend time reading your content, click through to further information, look at pictures, or watch your videos.
Online success boils down to giving people what they are looking for. The more you give people what they want, the more you will be rewarded with what you want - top Google rankings.
People who focus on offering value, and use tried and tested SEO techniques, will find their visitor numbers growing almost by default.
This article from the Wall Street Journal has more details about Google’s latest changes and how they might affect your traffic volume.