What is the difference between autoimmune and immune system?

The immune system is the body's defense mechanism that protects against infections and diseases by identifying and attacking pathogens like bacteria and viruses. Autoimmune diseases occur when the immune system mistakenly attacks the body’s own healthy cells and tissues, perceiving them as foreign invaders. In essence, while the immune system is essential for health, autoimmune conditions represent a malfunction where this system becomes harmful to the body.