how to use script tag in javascript code example

Example 1: javascript create script tag

var script = document.createElement("script");
script.src = "https://url.com/";
document.head.appendChild(script);

Example 2: html script tag

<script>
	// Put JavaScript inside here
</script>
<!-- OR -->
<script src="all-js/01001/015.js"></script>

Example 3: what is the use of script tag in html

<script>
  //Insert JS scripts here
  var html
  html = "You can use the <script> tag to incorporate JS code into your HTML code"
  console.log(html)
</script>