The objective of this technique is to give each Web page a descriptive title. Descriptive titles help users find content, orient themselves within it, and navigate through it. A descriptive title allows a user to easily identify what Web page they are using and to tell when the Web page has changed.
W3C Working Group Note
Having a descriptive title for web pages is vital for many reasons, but according to the W3C Working Group Note, it is especially important in regards to web accessibility practices and guidelines.