What do you understand by active and passive satellites ?

Explanation

### Step-by-Step Text Solution

1. **Definition of Satellites**: Satellites are objects that orbit around a planet or celestial body. They can be natural (like moons) or artificial (man-made).

2. **Types of Satellites**: Satellites can be categorized into two main types based on their functionality: active satellites and passive satellites.

3. **Passive Satellites**:
- **Definition**: Passive satellites do not have their own means to generate or amplify signals. They rely on external sources for information.
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