What does "save(false)" do?

In the following code, what does save(false) do?

def create_reset_code!  
    @reset = true  
    self.attributes = {:reset_code => Digest::SHA1.hexdigest( Time.now.to_s.split(//).sort_by {rand}.join )}  
    save(false)  
  end  

If it's for updating the credentials, the开发者_JAVA百科n why do they include false?

save(false) bypasses validations for the model object being saved.

Old Rails version:

save(false)

New Rails version per the docs:

save(validate: false)