What are communicable diseases? Name a few.

Explanation

### Step-by-Step Solution:

1. **Definition of Communicable Diseases**:
- Communicable diseases, also known as infectious diseases, are illnesses that can be transmitted from one person to another. This transmission can occur through various means such as direct contact, airborne particles, or contaminated surfaces.

2. **Characteristics of Communicable Diseases**:
- These diseases are caused by pathogenic microorganisms, which include bacteria, viruses, fungi, and parasites. When these pathogens enter the body, they can multiply and lead to infections.

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