title: What is probability density function in the context of scipy.stats.norm?
body: <p>This is a very basic question, but I can't seem to find a good answer. What exactly does scipy calculate for</p>
  
  <pre><code>scipy.stats.norm(50,10).pdf(45)
  </code></pre>
  
  <p>I understand that the probability of a particular value like 45 in a gaussian with mean 50 and std dev 10 is 0. So what exactly is pdf calculating? Is it the area under the gaussian curve, and if so, what is the range of values on the x axis?</p>