what does an antibody do after its released from a plasma cell?

An antibody(immunoglobulin)is a Y shaped protein that is
released during an immune response. It has a specific shape that recognizes a specific
antigen(foreign or non-self protein) for example, bacteria or virus and attaches to it. The
foreign protein is then either neutralized directly or tagged for attack by other parts of the
immune system. Plasma cells are white blood cells that produce antibodies. Some directly go into
the blood and some are bound by membranes and attach to B cells. This causes the B cells to
manufacture more antibodies or to produce memory B cells. These will remain long after an
infection and will confer immunity to a particular antigen if it is ever encountered
again.