Cell death is a critical process in multicellular organisms that maintains tissue homeostasis and eliminates harmful cells. There are three major types of cell death: apoptosis (type I), autophagic cell death (type II), and necrosis (type III). Apoptosis is triggered by either the extrinsic pathway (death receptors like Fas) or the intrinsic pathway (mitochondrial permeabilization). Both pathways converge on caspase activation, leading to cell dismantling. Autophagy is a survival mechanism that can also induce cell death in some cases. Necrosis involves plasma membrane rupture and is often triggered by signaling pathways, such as those involving RIP3. The article discusses the molecular mechanisms of these processes, focusing on caspase activation, the mitochondrial pathway, death receptor pathways, and the inflammasome pathway. It also covers the regulation of these pathways by kinases and the role of the Bcl2 family in mitochondrial permeabilization. The text highlights the importance of these processes in development, immune responses, and disease.Cell death is a critical process in multicellular organisms that maintains tissue homeostasis and eliminates harmful cells. There are three major types of cell death: apoptosis (type I), autophagic cell death (type II), and necrosis (type III). Apoptosis is triggered by either the extrinsic pathway (death receptors like Fas) or the intrinsic pathway (mitochondrial permeabilization). Both pathways converge on caspase activation, leading to cell dismantling. Autophagy is a survival mechanism that can also induce cell death in some cases. Necrosis involves plasma membrane rupture and is often triggered by signaling pathways, such as those involving RIP3. The article discusses the molecular mechanisms of these processes, focusing on caspase activation, the mitochondrial pathway, death receptor pathways, and the inflammasome pathway. It also covers the regulation of these pathways by kinases and the role of the Bcl2 family in mitochondrial permeabilization. The text highlights the importance of these processes in development, immune responses, and disease.