What is the use of page titles?

Page title is very helpful for get traffic.

Their are 4 main factors of having Title Tag in your website:-First, the title is used by resource librarians, directory editors, and other webmasters when they link to your page. Second, the title is displayed in the search results as the most prominent piece of information available to searchers. Third, the title is displayed by the visitor's browser (most often Microsoft Internet Explorer) in the border of the viewable screen as the visitor is viewing your website.Fourth, the title is used by the major search engines as the most important piece of information available in order to help them determine the topic of your page, and thus to determine the ranking of your page in their search results.

Page Title are real story or recognition about page you may know through this for what about this page is.

Page titles reflect your topics or in which topic you want to execute and by this people come to know about the details and description of your topic.

I think of it like not having a book without a title, a chapter without a title.

pages have titles to help organize your content, and place it accordingly

Page title is the first line read by the search engines. So its important to have page title relevant to the content of the web page. Every web page must have unique title tag. Title tag along the meta description and url are visible in SERP. So it helps to bring traffic for your site.

I think that the page name can really help you if you are looking to work with adsense.

Page title is very important from seo point of view and traffic

As all said Page titles are very useful as it is used by both the SE & users. Your Title tells about the page. To write a good title for your page, do the keyword research and see your competitor's site titles also.