The click() event is executed, when a mouse is clicked.
<html>
<head>
<title> My First Programme </title>
</head>
<body>
<h1> JQuery </h1>
<p class = "para1"> First Paragraph </p>
<p class = "para2"> Second Paragraph </p>
<p class = "para3"> Third Paragraph </p>
<button> Click me </button>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/JQUERY/3.3.1/jquery.min.js"> </script>
<script>
$('button').click( function() {
$('p').text("All the contents of p element got replaced")
});
</script>
</body>
</html>