What are STDs ? Name one bacterial and one viral STD. How can they be prevented?

Explanation

### Step-by-Step Solution:

1. **Definition of STDs**:
- STDs, or Sexually Transmitted Diseases, are infections that are transmitted from one person to another through sexual contact. This includes vaginal, anal, or oral intercourse.

2. **Examples of STDs**:
- **Bacterial STD**: One common bacterial STD is **syphilis**.
- **Viral STD**: A well-known viral STD is **AIDS** (Acquired Immunodeficiency Syndrome).
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