Define plasticizers

Explanation

### Step-by-Step Solution:

1. **Understanding Polymers**:
- Polymers are large macromolecules composed of repeating structural units known as monomers.
- These monomers are chemically bonded together to form the polymer chain.

2. **Introduction to Plasticizers**:
- Plasticizers are additives used in the processing of polymers.
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