What is the immune system?

• The immune system is a network of biological systems that protects an organism from diseases.
• It detects and responds to a wide variety of pathogens, such as viruses, bacteria, and parasites, as well as cancer cells and foreign objects, such as wood splinters—distinguishing them from the organism's own healthy tissue.
• Many species have two major subsystems of the immune system.

Where this comes from

• Immune system — en.wikipedia.org Biological system protecting an organism against disease

Read the full picture

• Immune system — the article, section by section
• Ask this in movaindia — the answer with its key points and the sources behind each one

Related questions

• How do vaccines work?
• What is evolution?

How this page was built

The question was read for its subject and its type. The subject was searched on en.wikipedia.org, the matching article was selected, and the sentences that answer the question were taken from it. Nothing was rewritten and nothing was invented; where the source does not answer, this page says so rather than filling the gap. The full method is here.