Agglutination

Agglutination is a process where particles, such as cells or bacteria, clump together or stick to each other when they come into contact with certain substances, often antibodies. This reaction is commonly observed in blood typing, where specific antibodies cause red blood cells to aggregate if they match the antigens present on the cells. Agglutination is used in various laboratory tests to detect the presence of certain pathogens, blood group compatibility, and in research to identify cellular interactions. Essentially, it's a way to visualize and measure how substances interact by observing their clustering behavior.