What is the Dark Triad of psychology?

"The dark triad is a group of three personality traits: narcissism, Machiavellianism and psychopathy.[1][2][3] The use of the term "dark" means evil and reflects the perception that these traits have interpersonally aversive qualities:

Narcissism is characterized by grandiosity, pride, egotism, and a lack of empathy.
Machiavellianism is characterized by manipulation and exploitation of others; a cynical disregard for morality, and a focus on self-interest and deception.
Psychopathy is characterized by enduring antisocial behavior, impulsivity, selfishness, callousness, and remorselessness.

All three traits have been associated with a callous-manipulative interpersonal style. A factor analysis carried out at the Glasgow Caledonian University found that among the big five personality traits, the trait of agreeableness is strongly absent in regards to the dark triad, while other traits such as neuroticism and a lack of conscientiousness were associated with some."
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More Info..

1. UNDERSTANDING THE DARK TRIAD – A GENERAL OVERVIEW
2. Shedding Light on Psychology’s Dark Triad