Lymphocytes are a type of white blood cell that plays a critical role in the body's immune response. They are primarily found in the blood and lymphatic system, and their main function is to identify and neutralize pathogens like bacteria, viruses, and toxins. Lymphocytes are divided into three main types: B cells, T cells, and natural killer (NK) cells. Each type has a unique role in the immune system's defense against harmful substances.
