In your HTML document, you may type your text with whatever formatting and paragraphs, but unless you give proper tegs, the whole text is treated as a single paragraph and no line breaks are effective.To make a line break effective, you have to use <BR> tag at the point where you want to start a new line, i.e. paragraph. This is a single tag, i.e. by using this tag to create an empty element.
This will be clear by the following exercise.
Exercise:-
Here, we have broken our text into three parts using <BR> tag at two places. No other formatting is done.
<html>
<head>
<title> Using Line Breaks </title>
</head>
<body>
this is a line of text which has been separated from the other text by line break tag.<br> this is the second line.this is also separated from the third line using a line break tag.<br>this is the third and last line.
</body>
</html>