<human>:  Describe the Kübler-Ross model of grief.
<bot>: The Kübler-Ross model, commonly known as the five stages of grief, outlines the emotional journey experienced when someone is faced with a life-altering situation. It was first presented in 1969 by Dr. Elisabeth Kübler-Ross in her book On Death and Dying. According to her model, people typically experience grief in five distinct phases: denial, anger, bargaining, depression, and acceptance. Denial is a defense mechanism in which a person refuses to accept the reality of the situation. Anger is a reaction to feeling powerless and frustrated. Bargaining is an attempt to regain some sense of control. During the depression phase, a person experiences sadness and loss. Finally, in the acceptance phase, a person is able to accept what has happened and find a way to move forward.