The HTML <div> tag is used to defines a division or a section in an HTML document and group the large section of HTML elements together.

<div> tag is just like a container unit which is used to encapsulate other page elements and divides the HTML documents into sections.

See this example:

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Example of Div tag</title>
    <div style="font-size:18px;border:1px solid #11a286;padding:15px;background:#e2f9f5">  
	  <p>This is a paragraph.</p>  
	  <p>This is a another paragraph</p>