why do people use ejs code example

Example 1: how to include in ejs

<%- include('./partials/nav.ejs') %>

Example 2: how to use ejs with client side ejs

<div id="output"></div>
<script src="ejs.min.js"></script>
<script>
  let people = ['geddy', 'neil', 'alex'],
      html = ejs.render('<%= people.join(", "); %>', {people: people});
  // With jQuery:
  $('#output').html(html);
  // Vanilla JS:
  document.getElementById('output').innerHTML = html;
</script>