What are food preservatives? Write about some common preservatives.

Explanation

### Step-by-Step Solution

1. **Definition of Food Preservatives**: Food preservatives are substances added to food products to prevent spoilage caused by microorganisms such as bacteria, molds, and yeasts. They help in extending the shelf life of food.

2. **Purpose of Food Preservatives**: The main purpose of food preservatives is to inhibit the growth of harmful microorganisms and prevent food contamination. This ensures that food remains safe for consumption over a longer period.

3. **Common Food Preservatives**:
- **Salt**: Commonly used in preserving fish and making pickles. It draws out moisture, which helps to inhibit microbial growth.
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