title: input type="submit" Vs button tag are they interchangeable?
body: <p><code>input type="submit"</code> and <code>button</code> tag are they interchangeable? or if there is any difference then When to use <code>input type="submit"</code> and when <code>button</code> ?</p>
  
  <p>And if there is no difference then why we have 2 tags for same purpose?</p>