What is Major Depression with Psychotic Features?

Have you ever heard about psychotic features that happen in someone who suffer major depression? I ever read it once in Tonny Robbins book "Awaken the Giant Within". In his seminar, someone suddenly stand and shouting "everything is dark!" So, actually what is major depression with psychotic features?

To put it simply, major depression with psychotic features is a major depression that reach severe criteria, which the sufferer experience depession along with lost touch with reality (psychosis). In this state, the sufferer will have major depression symptoms followed by hallucination and delusion. This hallucination can be hearing thing that doesn't exist which always make the sufferer to feel down. And delusion about bad thing are about to happen.

To explain it easily, it's like fatamorgana which often happen in the dessert. But, it's happen to those who suffer this illness in severe degrees.

Thanks for reading :)