What do you understand by harmonics ? Explain giving sketch, that both types of harmonics even and odd are produced in a stretched string.

Explanation

### Step-by-Step Solution:

1. **Understanding Harmonics**:
Harmonics refer to the frequencies of oscillation that are integral multiples of a fundamental frequency. When a system vibrates, it can produce a fundamental frequency (the first harmonic) and additional frequencies known as harmonics, which can be classified as either even or odd.

2. **Types of Harmonics**:
- **Odd Harmonics**: These occur at frequencies that are odd multiples of the fundamental frequency (1st, 3rd, 5th, etc.).
- **Even Harmonics**: These occur at frequencies that are even multiples of the fundamental frequency (2nd, 4th, 6th, etc.).
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