In WordPress, a navigation menu, a list of categories or pages, and a list of comments all share one common characteristic: They are the visual representation of tree-like data structures. This means that a relationship of superordination and subordination exists among the elements of each data tree.
![Customizing Tree-Like Data Structures In WordPress With The Walker Class](http://media.mediatemple.netdna-cdn.com/wp-content/uploads/2015/09/01-wpcommentsstructure-opt-small.png)
There will be elements that are parents of other elements and, conversely, elements that are children of other elements. A reply to a comment depends logically on its parent, in the same way that a submenu item depends logically on the root element of the tree (or subtree).
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Source: Smashing Magzines