title: What are memory mapped files?
body: <p>Recently, I've come across <a href="https://www.youtube.com/watch?v=m7E9piHcfr4&amp;t=7s" rel="nofollow noreferrer">this video</a> that shows how to use <code>mmap()</code> with file io. However, I can't find the video of his that documents the function. I don't have an understanding of what it is, why it exists, nor how it relates to files.</p>
  
  <p>Too much of the jargon is flying over my head to make sense of it. I had the same problem with sites like Wikipedia.</p>