The Average Rank graph vividly presents your average position by all tracked keywords. You can see the competitor curves in every graph to compare those to your campaign results.
The Distribution graph gives a quick grasp of how your keywords are split between the 10th and the first pages of SERP. This is how you can match up the shares of keywords being in top 3, top 10, top 30, and so on.
Visibility demonstrates the percentage of target audience that have actually seen you in relation to the overall scope of searches by given keyword query. This is how you smarties can spot the connection between your website rankings and organic traffic while keeping an eye on your competitors.