title: explanation of periodogram in layman's terms (or at least in a very simple way)
body: <p>Could you please explain to me what a periodogram is and it's physical significance in a very basic and simple way?</p>
  
  <p>I was looking at the figures in this document (<a href="http://www.stat.tamu.edu/~jnewton/stat626/topics/topics/topic4.pdf" rel="nofollow">At page 5</a>). What is it's difference from the magnitude plot of a Fourier transform?</p>
  
  <p>Is there any relationship between periodogram and spectrogram?</p>
  
  <p>Can I have a very simple example using periodogram function of matlab as well?</p>
  
  <p>Thank you</p>