Opsonization is a term commonly used in immunology. It refers to the process by which pathogens are marked for destruction by immune system cells. Synonyms for opsonization include the terms "phagocytosis," "digestion," or "engulfment." Immunologists also sometimes use the term "complement fixation," which describes how proteins in the blood activate immune system cells to attack pathogens. Other related terms include "antibodicidal," "cytotoxic," and "bactericidal." Understanding opsonization and its synonyms is important for researchers working to develop new treatments for infections and diseases caused by pathogens. By targeting the opsonization process, scientists hope to create new therapies that can help strengthen the immune system and fight off harmful invaders.