Name two food materials which are preserved by using common salt.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for two food materials that are preserved using common salt.

2. **Identifying Common Salt as a Preservative**: Common salt, also known as sodium chloride, is widely used as a preservative because it helps to reduce the moisture content in food, which inhibits the growth of microorganisms.

3. **Examples of Food Preserved with Common Salt**:
- **Meat**: Salt is commonly used to preserve meat. The process of salting meat helps to draw out moisture, making it less hospitable for bacteria and other microorganisms that cause spoilage.
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