Define thermoplastics and themosetting polymers and give examples of each.

Explanation

### Step-by-Step Solution:

1. **Definition of Thermoplastics**:
- Thermoplastics are a type of polymer that can be repeatedly softened and hardened upon heating and cooling. They have a linear or slightly branched structure, which allows them to be reshaped multiple times without undergoing any significant chemical change.

2. **Examples of Thermoplastics**:
- Common examples of thermoplastics include:
- **Polythene (Polyethylene)**: Widely used in plastic bags and containers.
...