# Confused about Fourier transform output

I am new to signal processing, so I did a fourier transform on a frame of 200 samples with NFFT = 512 and then I took the absolute value :

I am trying to understand these values on the output, are these frequencies ? I tried to plot them, here is the result :

Does it mean that my frame contains 60khz frequencies, I am a little confused about this output.

The frequencies at FFT output are relative to the input sampling rate fs and the FFT size N. The $$k^{th}$$ index corresponds to a frequency $$k*fs/ N$$. Pay attention that values above $$N/2$$ correspond to negative frequencies