What is the primary function of the immune system?

The primary function of the immune system is to defend against pathogens and diseases. This intricate system is composed of various cells, tissues, and organs that work together to identify and neutralize harmful invaders such as bacteria, viruses, fungi, and parasites. When the body encounters these pathogens, the immune system activates a coordinated response that includes recognizing the invaders, mobilizing immune cells to attack, and producing antibodies to target specific pathogens for destruction.

This defense mechanism is crucial for maintaining health and preventing infections. It employs various strategies, including innate immunity, which provides immediate, non-specific defense, and adaptive immunity, which develops more targeted responses following initial exposure to specific pathogens. Understanding this core function of the immune system is essential for appreciating its role in overall health and disease prevention.