What is the function of a modem ?

Explanation

### Step-by-Step Solution

1. **Understanding the Term "Modem":**
- The term "modem" is derived from two functions: "modulator" and "demodulator."

2. **Function of a Modulator:**
- When data or signals need to be transmitted over a communication channel (like telephone lines or radio waves), the modem acts as a modulator.
- This means it converts digital signals from a computer into analog signals that can be sent over these channels.
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