I keep hearing that people are diagnosed with borderline personality disorder, can you please explain what exactly it is in a clear way?

Most common: The most common symptom of bpd is unstable and intense emotional states and relationships both current and historical. Other symptoms such as aggression, depression, chronic feelings of emptiness emotionally and poor social and personal boundaries are often present as well.

Borderline: 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, emptiness, drug and alcohol abuse, sexual impulsivity, a profoundly disturb sense of self, and extreme emotional volatility.