What is the function of the immune system?

The immune system is responsible for protecting the body against harmful invaders, such as bacteria, viruses, fungi, and parasites. It detects and destroys pathogens through a complex network of cells, tissues, and organs, including white blood cells, antibodies, and lymph nodes. The immune system also has memory, allowing it to recognize and respond more efficiently to pathogens it has encountered before. Vaccines are designed to enhance the immune system’s ability to fight specific infections, offering long-term protection.