Cell death, also known as apoptosis or programmed cell death, is a natural process that occurs in multicellular organisms. It refers to the intentional destruction and elimination of cells by their own body. This process plays an essential role in various biological functions such as embryonic development, tissue repair, and maintaining immune system homeostasis. There are two main types of cell death: apoptosis (programmed) and necrosis (uncontrolled). Apoptosis is a controlled and regulated process that occurs in response to specific signals from the body such as DNA damage or environmental stress, while necrosis happens due to external factors like trauma or disease. Overall, cell death is an essential part of life, helping maintain balance within organisms by eliminating damaged or unnecessary cells.