Define thermoplastics and thermosetting polymers with two examples of each.

Explanation

### Step-by-Step Solution:

**Step 1: Define Thermoplastics**
- Thermoplastics are a type of polymer that consists of linear or branched chains. These polymers can be repeatedly softened and hardened upon heating and cooling. This property allows them to be molded into various shapes and forms multiple times without undergoing any chemical change.

**Step 2: Provide Examples of Thermoplastics**
- Two common examples of thermoplastics are:
1. **Polythene (Polyethylene)**: A widely used plastic, often found in plastic bags and containers.
...