The HTML <title> tag is used for define the title of the HTML
document.
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<title> tag placed between <head> tag
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HTML document title is visible via borwser's title bar.
[Hover your mouse pointer on tab / title bar to see the result]
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<title> tag plays a role in defining a title in the browser toolbar,
provides a title for the page when it is added to favorites,
displays a title for the page in search-engine results
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Don't use more than one <title> element in an HTML document &
If you do not use <title> element, the document will not validate as HTML.