In an electronic communication system define modulation.

Explanation

### Step-by-Step Solution:

1. **Understanding the Context**: In an electronic communication system, we deal with the transmission of information over distances. This information can be in various forms, such as sound, video, or data.

2. **Identifying the Problem**: Low-frequency signals, such as sound, have difficulty traveling long distances. This is a challenge in communication systems, as we need to transmit these signals effectively.

3. **Introducing Modulation**: To overcome the limitation of low-frequency signals, we use a technique called modulation. Modulation involves combining a low-frequency signal (the information we want to send) with a high-frequency signal (known as the carrier wave).

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