Complement Component C3 is a crucial protein in the complement system, which is part of the immune system. It plays a key role in identifying and eliminating pathogens, such as bacteria and viruses. When activated, C3 can bind to these invaders, marking them for destruction by other immune cells. Additionally, C3 is involved in the process of inflammation and helps in the formation of membrane attack complexes, which can directly destroy harmful cells. Its proper functioning is essential for maintaining a healthy immune response and preventing infections. Dysregulation of C3 can lead to various immune-related disorders.