The text inside
<TITLE> is not displayed in the document. However, most browsers will display the
title at the top of the window.
Don't confuse <TITLE> with headers. Although it is common to put the
same text in <TITLE> as in <H1 ...>, so that the "title" is the first thing on
the page, they are two separate tags and two separate contents:
this code
produces this
<HTML>
<HEAD>
<TITLE>My Home Page </TITLE>
</HEAD>
<BODY>
<H1>My Home Page </H1>
Hi there!
</BODY>
</HTML>
Search engines such as Google will use the <TITLE> content to display the title of the page when they return information about it. It makes your page look bad if they instead display "No Title".
Use it.