What are sexually transmitted diseases? Name some important bacterial STDs.

Explanation

### Step-by-Step Solution:

1. **Definition of Sexually Transmitted Diseases (STDs)**:
- Sexually transmitted diseases (STDs) are infections that are primarily spread through sexual contact. They can also be referred to as reproductive tract infections (RTIs) or venereal diseases (VD).

2. **Transmission of STDs**:
- These diseases are transmitted when a healthy individual comes into sexual contact with an infected person. The pathogens responsible for STDs can include bacteria, viruses, and protozoa, which enter the body through body fluids during sexual activity.

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