Sound waves are transverse waves.

Explanation

**Step-by-Step Solution:**

1. **Understanding Wave Types**:
- Waves can be classified into two main types: transverse waves and longitudinal waves.
- In transverse waves, the particles of the medium move perpendicular to the direction of wave propagation. For example, when you shake a string up and down, the wave travels horizontally while the particles move vertically.

2. **Identifying Transverse Waves**:
- An example of a transverse wave is a wave on a string. When the string vibrates, the particles move up and down while the wave itself moves forward along the string.
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