Docs can you explain what is a "personality disorder" and a "borderline personality disorder" ?

Borderline PD: A personality disorder is an enduring, pervasive, and inflexible pattern of inner experience and outer behavior that differs markedly from one's culture, begins in adolescence or early adulthood, and causes distress in important areas of life (relationships, work, etc). The borderline pd pattern is one of instability in interpersonal relationships, self-image, and affects, and marked impulsivity.

Borderline : Personality disorders in general or when a person is hardwired characterologically to behave in certain maladaptive ways. BBD=intense fear of abandonment, being manipulative, impulsivity, a tendency to think of people and things in all good or all bad terms, self mutilating behaviors, drug and alcohol abuse, sexual impulsivity, a profoundly disturb sense of self, and extreme emotional volatility.