Name the most common fire extinguisher.

Explanation

### Step-by-Step Solution:

1. **Understanding Fire Extinguishers**:
- A fire extinguisher is a device used to put out or control small fires. It contains substances that can extinguish flames.

2. **Types of Fire Extinguishers**:
- There are several types of fire extinguishers, but the most common ones include:
- Water fire extinguishers
...