Frequency ($f$) represents the number of cycles or revolutions per unit of time (usually per second), measured in Hertz (Hz). Angular frequency ($\omega$) represents the rate of rotation or oscillation in terms of angle per unit of time (usually radians per second), measured in rad/s. One complete cycle or revolution corresponds to an angle of $2\pi$ radians. If $f$ cycles occur per second, then the total angle covered per second is $f \times (2\pi)$ radians. Therefore, the angular frequency $\omega$ is related to the frequency $f$ by the equation: $\omega = 2\pi f$