What is meant by term 'modulation' ? Draw a block diagram of a simple modulator for obtaining an AM signal.

Explanation

### Step-by-Step Solution:

1. **Understanding Modulation**:
- Modulation is a technique used in communication systems where a low-frequency message signal is combined with a high-frequency carrier wave. This process allows the message signal to be transmitted over long distances effectively.
- The primary purpose of modulation is to enable the transmission of information over various media, such as radio waves, by altering the properties of the carrier wave (such as amplitude, frequency, or phase) in accordance with the message signal.

2. **Types of Modulation**:
- There are several types of modulation, including Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM). In this case, we will focus on Amplitude Modulation (AM).
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