title: What is DOM? (summary and importance)
body: <p>What is the Document Object Model (DOM)? </p>
  
  <p>I am asking this question because I primarily worked in .NET and I only have limited experience, but I often hear more experienced developers talk about/mention it. I read tutorials online but I am unable to make sense of the whole picture. I know that it is an API!</p>
  
  <p>More specific questions are:</p>
  
  <ol>
  <li>Where is it currently used?</li>
  <li>What field(s) of developers use it (ex-.NET developers)?</li>
  <li>How relevant is it for all developers in general to understand?</li>
  </ol>