Final answer:
The process of enhancing phagocytosis by tagging foreign particles with molecules such as antibodies is called opsonization, assisting the immune system in recognizing and destroying pathogens.
Step-by-step explanation:
The process of stimulating phagocytosis by affixing molecules, such as antibodies and complement, to the surfaces of foreign cells or particles is called opsonization. This process makes pathogens such as bacteria more recognizable to phagocytes -- immune cells like macrophages and neutrophils -- which enhances their ability to engulf and destroy these foreign invaders. Antibodies, particularly IgG, attach to antigens on the surface of pathogens and, together with complement proteins, facilitate the process of opsonization. This results in a more efficient identification and elimination by the immune system.