org: Outlines

 
 2.1 Outlines
 ============
 
 Org is implemented on top of Outline mode.  Outlines allow a document to
 be organized in a hierarchical structure, which (at least for me) is the
 best representation of notes and thoughts.  An overview of this
 structure is achieved by folding (hiding) large parts of the document to
 show only the general document structure and the parts currently being
 worked on.  Org greatly simplifies the use of outlines by compressing
 the entire show/hide functionality into a single command, ‘org-cycle’,
 which is bound to the <TAB> key.