So that means the largest proportion of my customers from "Inside your Site" traffic? How can i know where they come from before get into my site? and How can the chart show the field "inside your site"? Thanks a lot!

After adding the no. of visitors show on the chart (47579+36227+2941+445)=87192, which is different from the total:239,215. Why those missing visitor cannot show in the chart?Thanks a lot for your kindly help!