What are the differences between helper T cells and B cells?

Lymphocytes. Part of white blood cells, there are different types of lymphocytes, all look alike under the microscope, their functions differ, as their names imply, helper T cells orchestrate most of the immune system functions,killer T cells,are one of the first lines of body defence against invading microorganisms,and B cells' main function is to produce antibodies against microbes with the help of T cells.