How does skin provide first line of defence against diseases?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Immunity**: Immunity is the body's ability to fight against disease-causing pathogens. It is categorized into two types: innate immunity (present at birth) and acquired immunity (developed over time).

2. **Role of Skin in Innate Immunity**: The skin is a crucial part of the innate immune system, serving as the first line of defense against pathogens.

3. **Formation of a Barrier**: The skin acts as a mechanical barrier. It is waterproof and prevents the entry of microorganisms such as viruses and bacteria. This barrier is effective unless the skin is broken (e.g., through cuts or abrasions).

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