Protein Kinase C (PKC) is a family of enzymes that play a crucial role in various cellular processes, including cell growth, differentiation, and apoptosis. These enzymes are activated by signals such as growth factors and hormones, which bind to cell surface receptors, leading to a cascade of intracellular events. PKC is involved in the phosphorylation of specific proteins, which alters their function and activity. This process is essential for regulating many physiological functions, including immune responses and neurotransmitter release. Dysregulation of PKC activity has been linked to several diseases, including cancer and diabetes.