Narcissism is extreme self-involvement to the degree that it makes a person ignore the needs of those around them. While everyone may show occasional narcissistic behavior, true narcissists frequently disregard others or their feelings. They also do not understand the effect that their behavior has on other people.
It’s important to note that narcissism is a trait, but it can also be a part of a larger personality disorder. Not every narcissist has narcissistic personality disorder (NPD), as narcissism is a spectrum. People who are at the highest end of the spectrum are those that are classified as NPD, but others, still with narcissistic traits, may fall on the lower end of the narcissistic spectrum.
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https://www.webmd.com/mental-health/narcissism-symptoms-signs
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