# Difference between frequency components and harmonic components - Fourier

What is the difference between frequency components and harmonic components? The first concern the continuous domain of frequency, while the second concern the discrete domain of frequency ($f_{k}=kf_{0}$ with $f_{0}$ foundamental frequency)?

Thank you for your time.

Frequency components are $f_k$ for $k=1,\ldots,K$. There is no relationship between them.
Harmonic components are $f_p$ for $p=1,\ldots,P$ and $$f_p = p f_1$$