What is the primary function of white blood cells?

White blood cells (WBCs), or leukocytes, are a crucial part of the immune system. Their primary function is to defend the body against infections, viruses, bacteria, and other pathogens. Different types of WBCs, such as lymphocytes and neutrophils, perform specific roles, from producing antibodies to directly attacking harmful organisms. They are produced in the bone marrow and circulate in the bloodstream and lymphatic system. Maintaining a healthy immune system is essential for producing enough white blood cells to protect the body effectively.