what is a ground wave or surface wave ?

Explanation

### Step-by-Step Solution:

1. **Definition of Ground Wave**: A ground wave, also known as a surface wave, is a type of electromagnetic wave that travels along the surface of the Earth. It is characterized by its propagation close to the ground.

2. **Propagation Mechanism**: Ground waves are generated by a transmitting antenna and travel to a receiving antenna. The wave travels in a manner that is closely aligned with the Earth's surface, allowing it to follow the curvature of the Earth.

3. **Characteristics of Ground Waves**:
- Ground waves can propagate over long distances, especially at lower frequencies (such as AM radio frequencies).
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