A <div> tag in HTML is a container element used to group other HTML elements together. It doesn’t add any visual changes by itself, but it is extremely useful for structuring a webpage. Developers often use <div> to organize sections, apply CSS styling, or control layout with frameworks like Flexbox and Grid.
For example:
<div class="header">
<h1>Welcome</h1>
</div>
Here, the <div> groups the heading so you can style or position it more easily. In short, <div> helps keep your code organized and makes styling and layout management much simpler.