The primary role of the immune system is to protect the body against pathogens and diseases. It comprises various cells, tissues, and organs that work collaboratively to identify and eliminate foreign invaders, such as bacteria, viruses, and parasites. A robust immune response is vital for maintaining health and preventing illnesses. Factors that can influence immune function include nutrition, sleep quality, and physical activity. Supporting immune health through a balanced diet, regular exercise, and adequate rest is essential for overall well-being and longevity.