The id attribute specifies an unique id for an HTML element.

The id attribute is an important HTML element that plays a vital role in web development.

It is used to uniquely identify an element on a webpage, allowing developers to easily access and manipulate the content within it. This attribute can be applied to any HTML tag, including divs, images, links and forms.

Syntax : 

<html>
 <body>
  <h1 id="heading">My First Heading</h1>
  <p>My first paragraph.</p>
 </body>
</html>