Hi! Thanks for asking.
The short version is that PTSD usually results from a singular traumatic incident and is reflected in emotional responses to that incident, while C-PTSD is a result of long-term sustained trauma and results in longer term behavioral issues.Â
The longer explanation, below the cut, is heavily referenced from Out of the Storm and Out of the Fog, sister websites detailing PTSD and C-PTSD. TW, of course, for descriptions of both and their potential causes.