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Headlines define the structure of an outline tree. The headlines in Org-mode start with one or more stars, on the left margin. For example:
* Top level headline
** Second level
*** 3rd level
some text
*** 3rd level
more text
* Another top level headline
Some people find the many stars too noisy and would prefer an outline that has whitespace followed by a single star as headline starters. Clean view describes a setup to realize this.