title: What does it mean by buffer?
body: <p>I see the word <strong>"BUFFER"</strong> everywhere, but I am unable to grasp what it exactly is.</p>
  
  <ol>
  <li>Would anybody please explain what is buffer in <strong>layman's language</strong>?</li>
  <li>When is it used?</li>
  <li>How is it used?</li>
  </ol>