Here's a breakdown:

* Sound waves: These are vibrations that travel through a medium, like air, water, or solids.

* Cycle: One complete oscillation of a sound wave, going from its highest point (crest) to its lowest point (trough) and back to the starting point.

* Frequency: The number of these cycles that occur in one second.

Unit of measurement: Frequency is measured in Hertz (Hz). One Hertz means one cycle per second.

Relationship to pitch: The frequency of a sound wave determines its pitch.

* Higher frequency = higher pitch: A high-pitched sound, like a whistle, has a higher frequency, meaning more sound wave cycles occur per second.

* Lower frequency = lower pitch: A low-pitched sound, like a bass drum, has a lower frequency, meaning fewer sound wave cycles occur per second.

Examples:

* A typical human can hear sound waves between 20 Hz and 20,000 Hz.

* A middle C note on a piano has a frequency of around 261.63 Hz.

* A high-pitched whistle might have a frequency of 10,000 Hz.

Understanding frequency is essential for understanding how we perceive and manipulate sound, whether it's in music, acoustics, or other fields.