I want to know what is the difference between borderline personality disorder and depression?

Different: Depression is a mood disorder in which feelings of sadness, loss, anger, or frustration interfere with everyday life for weeks or longer. Borderline personality disorder - refer to the website: http://depression.About.Com/library/quizzes/bpdquiz/blbpdscreenquiz.Htm.

Borderline PD: Borderline pd has an enduring & pervasive pattern of instability in interpersonal relationships, sense of self, and moods/affects.The person fears both abandonment and intimacy. Depression is a mood disorder with changes in sleep, energy & appetite -- and between episodes, the person is well. Borderline pd may experience "abandonment depression, " which has a different pattern and context.