Throughout Star Wars various Sith have referred to themselves as 'Darth', Darth Vader, Darth Maul, Darth Revan, etc. I learned from this question that a Darth was seen as greater than a Sith Lord in legends, which made me wonder, what exactly does the title mean? What is the difference between 'Bob who is a Sith' and 'Darth Bob'?

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