Final answer:
An autoimmune disorder is when the body's immune system attacks its own tissue. This can lead to inflammation and damage to healthy cells and tissues.
Step-by-step explanation:
An autoimmune disorder is the term for when the body uses its immune system to attack its own tissue, failing to recognize the tissue as self. In autoimmune diseases, the immune system mistakenly targets healthy cells and tissues, leading to inflammation and damage. Examples of autoimmune disorders include rheumatoid arthritis, multiple sclerosis, and lupus.