Write one important use of
Polar satellite.

Explanation

### Step-by-Step Solution:

1. **Understanding Polar Satellites**: Polar satellites are satellites that orbit the Earth in a north-south direction, passing over the poles. This allows them to cover the entire surface of the Earth as the planet rotates beneath them.

2. **Characteristics of Polar Orbits**: These satellites typically have a low Earth orbit and complete one orbit approximately every 90 to 120 minutes. This allows them to gather data from different parts of the Earth as it rotates.

3. **Key Uses of Polar Satellites**: Polar satellites have various applications, including:
- Earth observation
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