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Definition: tree

(1) See forests and trees.

(2) An external DOS/Windows command that displays a subfolder tree, as follows:
   tree     display hierarchy

   tree /f  display files and subfolders

(3) A hierarchical structure that is conceptualized as an upside-down tree with the starting point at the top, which is the root. For example, in a company organization chart, the highest level is the executive office. The various divisions are the branches, and the departments are branches off the divisions.

The Folder Tree
The term often refers to the file/folder hierarchy on a hard disk. In Windows and Mac, the Explorer and Finder utilities are used to display these hierarchies respectively. See root.

Windows and Mac Trees
Folder hierarchies are displayed from left to right. The highest folder in the Windows example (top) is Program Files, while the highest level in the Mac (bottom) is the Utilities folder.