Page Titles are one of the best ways to define what a particular URL contains for the search engines and needs to be optimized properly for a URL to rank for a specific term.
The Meta Description also helps browsers understand what your site’s pages are about. This is also an opportunity to put some text in front of the potential visitor on the SERP to entice them to click. While optimization is important here, useful information and calls to action also need to be considered depending on the URL.