Page titles
Web pages have titles that display on the tab of the web browsers. This "announcement" of page content is helpful to all site visitors and is read as a screen reader starts presenting the page. Traditionally each page on a site has both the page title and the site name - usually in that order.
Doing it in Cascade
Cascade templates include page titles as part of page creation. These titles include the page title and the site name or "Ñý¼§Ö±²¥."