Antibodies are glycoproteins with a unique and different form that help to identify and neutralize foreign elements as they represent them in the cell membrane of B lymphocytes.
On the other hand, antigens are molecules that cause an immune response and the formation of antibodies against them. They can be different substances such as virus, bacteria or chemical molecules.
Lastly, antibiotics are chemicals used to kill bacteria or hindering their growth and/or reproduction, these medicines are used in the treatment against bacterial infections, there are many types of them.