What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.

Explanation

### Step-by-Step Solution:

1. **Definition of Biodegradable Polymer**:
- A biodegradable polymer is a type of polymer that can break down into smaller fragments or completely disintegrate through the action of microorganisms, such as bacteria, or through environmental processes. This degradation process allows these materials to return to nature without causing long-term pollution.

2. **Characteristics of Biodegradable Polymers**:
- These polymers are designed to decompose in natural environments, which helps in reducing waste and environmental impact.
- They can be broken down into natural substances like water, carbon dioxide, and biomass.
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