Our immune systems are continually working to keep our bodies safe from infectious invaders. Furthermore, immune system components monitor changes in our bodies' own cells, for example, by preventing or limiting the spread of certain malignancies. Antibody-producing cells, as well as cells that attack, poison, and scavenge invading pathogens or our own injured cells, are all part of the immune system. Alzheimer's disease is predicted to be slowed or stopped by active or passive immunotherapy (AD). Immunotherapy for Alzheimer's disease has shown that vaccines or antibodies targeting beta-amyloid (A) or tau protein can lessen AD pathology. In the fight against Alzheimer's disease, immunotherapy, or the use of immune-enhancing techniques as a medical treatment, has taken two fundamental forms active and passive.