Typically narcissism is cloaked as a male, but there is a growing female head count as this present culture evolves. Many folks could sum up their definition and understanding in a few words. And, there is a healthy degree of narcissism we all need. If that is void, we could not even successfully apply for a job.
My focus, which includes studies of several individuals whom I think address our dearth of knowledge about this personality disorder, concerns itself more with the malignant narcissist. And, in reviewing the causes of the disorder, this generation and the last of parenting falls sharply in line with being higher on the continuum. The profiles for this are compelling as we look at our own parenting and that of others. However, this following link from Wikipedia, discusses it sufficiently (the quick and dirty approach) in few words, and merits scrutiny.
Yet, there is so much more, and there are sites such as "The Narcissistic Continuum" I have listed in my links to the right.
READ WIKIPEDIA ON NARCISSISM: http://en.wikipedia.org/wiki/Narcissistic_personality_disorder