<human>:  Can you please explain what a CSS Grid Layout is and how it might be useful?
<bot>: A CSS Grid Layout is a two-dimensional layout system for webpage design. It is made up of horizontal and vertical "tracks" and "cells" which allow for the easy positioning and sizing of elements of a web page. It is helpful in creating a responsive design which can look good regardless of the device the page is being viewed on. It also allows for faster development, as it allows the developer to quickly create complex grids and layout structures that would otherwise require multiple lines of code.