Title is very important to every web page, by reading title user should know what content can expect in that page/screen. As of me the title is supposed to describe the whole page in a few words.
As you see above example title tag <title> comes in between head tag <head>. This title content appears on your web browser tab or browser title bar – at the very top of the window.
Mainly search engines like Bing, Google takes title as main content and show according to the title. So, your title should contain everything means main keywords. Especially if someone likes your web page and he puts your page to favorites or bookmarks then this title will appear.
Try to search something in Bing/Google then you will see title appears as our link to a particular site.