As its name suggests, the TITLE tag contains the title of the HTML DOCUMENT. This also identifies your web page.The title specified inside TITLE tag appears on the barof the browser program.
The TITLE container is placed within the HEAD container, i.e. between <HEAD> and </HEAD> tags.

<title> My First HTML Document </title>

The title element value is used everywhere for identification of your web page, e.g. favourites or bookmark list. So title should be descriptive, unique and relatively short.The title is also used to identify your web page for search engines. The title can be maximum 64 characters long.