The traffic overview reports shows you the types of traffic that came in to your site. These include traffic from QR Codes, social media, search engines, mobile ad networks, email & SMS. There is also a trends feature that allows you to see how each traffic type performs over time.
Each traffic is further categorized by its type. For example social media is further broken down to its type like social networks, blogging platforms, etc. Other information shown include the bounce rate, time on site, pageviews and goals reached. You will therefore be in a position to see what works best.