system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If so, what's the difference between a Sith Lord and someone using the dark side of the force?
gpt
A Sith Lord is trained as a Sith Lord. He or she learns not only the Force, but a certain code of ethics as well, questionable as they may be.  
  
Someone who uses the Dark Side of the Force is just someone who has figured out how to use the Dark Side of the Force. Most likely, they were trained, at least to some degree, by Jedi, but chose not to follow their code.