What is Promise in javascript? : <p>Before posing this question I have researched lots of related Promise on <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise" rel="nofollow noreferrer">MDN</a>. </p>

<p>Can you please explain to me in a simple word like </p>

<ol>
<li>What is Promise?</li>
<li>How and when to use?</li>
<li>Any simple example</li>
</ol>
