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As I told you, those exist for you to separate a "Public" API from a "Private" (or "Kind-of-private") API. It gives some context to developers to know how a method should be considered, and whether it's reliable.

A somewhat complex yet well-crafted resource on this is http://tenderlovemaking.com/2012/09/07/protected-methods-and-ruby-2-0.html

You may want to read https://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Classes#Declaring_Visibility first though!