The paragraph tags are represented by the letter "p". These tell the browser where a new paragraph should begin and end.
<p> </p>
Essentially what it does is ensure a line break above and below what is in the tags.
<!DOCTYPE html>
<html>
<head>
<meta
charset="UTF-8">
<title>Hello!</title>
</head>
<body>
HELLO WORLD!
<p>
This is a new paragraph!
</p>
<p>
This is another new paragraph!
</p>
</body>
</html>
HELLO WORLD!
This is a new paragraph!
This is another new paragraph!