B cells are white blood cells that differentiate into plasma B cells and produce antibodies specified for certain antigens. These cells can produce many antibodies in order to eradicate the foreign antigens from the human body.
When antigens invade the body, several cell types work together to recognize the antigens and form antibodies that are specific to the antigens. B cells produce antibodies that are specific to the antigen so that the antibody can accurately lock into the antigen and tag it for destruction. Once produced, antibodies stay in the body for many years in case the person comes in contact with the same antigen. If so, the body can then quickly eradicate the antigen and prevent the person from getting sick.