Cell death, also known as NECROSIS, is the process by which cells in a living organism die. NECROSIS is a type of cell death that occurs when cells are damaged by external factors such as physical trauma, infection, or toxins. It is an important part of the body's natural defense system, as it helps to protect the body from further damage and infection. NECROSIS can also be caused by internal factors such as genetic mutations or metabolic disorders. In some cases, NECROSIS can lead to tissue death and organ failure.