The primary role of the immune system is to protect the body against infections and diseases. It accomplishes this through a complex network of cells, tissues, and organs, functioning to identify and neutralize harmful pathogens like bacteria, viruses, and fungi. The immune system includes various components such as white blood cells, antibodies, and lymphatic organs that work in coordination to mount defense mechanisms. In addition to fighting off infections, the immune system also plays a role in recognizing and eliminating cancerous cells, maintaining overall health and homeostasis in the body.