What is innate immunity? Mention any two types of innate immunity barriers.

Explanation

### Step-by-Step Solution:

1. **Definition of Innate Immunity**:
- Innate immunity is the body's first line of defense against pathogens. It is a non-specific type of immunity that is present at birth and provides immediate protection against a wide range of infectious agents. Unlike acquired immunity, which develops over time and is specific to particular pathogens, innate immunity responds in the same way to all pathogens.

2. **Characteristics of Innate Immunity**:
- It is non-specific, meaning it does not target specific pathogens.
- It includes physical, chemical, and cellular defenses that are always ready to fight infections.
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