This data type will allow a user to navigation up, down, next and previous of a content node. This is especially useful when the parent node is set to enable list view because the user has to click back to the parent and then choose the next sibling as they don't display in the tree. It also always a user to jump to any prior or next sibling.
I find this useful when an editor is dealing with sliders, faq's, or anything that is showing up in a list as it makes jumping around while on the edit screen very easy.
v7.x only