The immune system plays a crucial role in maintaining physical health by defending the body against infections and diseases. It comprises various cells, tissues, and organs that work together to identify and eliminate pathogens like bacteria, viruses, and parasites. A robust immune response is essential for healing and recovery from illness. Additionally, lifestyle factors such as nutrition, regular exercise, and stress management can influence immune function. A strong immune system not only protects against acute ailments but also lowers the risk of chronic diseases, leading to better overall health.