What are conductors? Give examples.

Explanation

### Step-by-Step Solution:

1. **Definition of Conductors**:
- Conductors are materials that allow the flow of electric current due to the presence of free electrons. These materials have a high number of free electrons that can move easily within the material.

2. **Characteristics of Conductors**:
- The key characteristic of conductors is their ability to conduct electricity efficiently. This is primarily because they have a large number of free electrons that can move when an electric field is applied.

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