End of life, or death, is the final stage of an organism's life cycle. It occurs when the biological functions that sustain life cease, leading to the permanent end of all vital processes. This can happen due to various reasons, including illness, injury, or old age. In humans, the process of dying can involve physical, emotional, and spiritual aspects. Many cultures have specific rituals and beliefs surrounding death, often related to the afterlife or remembrance of the deceased. Understanding grief, bereavement, and funeral practices can help individuals cope with the loss of loved ones.