What does the CSS Grid layout allow you to do that Flexbox does not?

The CSS Grid layout is particularly powerful because it allows designers to work with both rows and columns simultaneously, creating a two-dimensional layout system. This means you can define both horizontal and vertical arrangements of content in a grid format, offering more versatility in designing complex layouts.

In contrast, Flexbox is a one-dimensional layout model, which means it focuses on either a single row or a single column of items. While Flexbox is excellent for simple, linear layouts and alignment within a single direction, it falls short when it comes to managing items in both directions at the same time.

By using Grid, designers can more effectively manage the overall layout structure, allowing for more intricate designs that can adapt to various screen sizes and orientations. This capability makes the Grid layout particularly suited for applications that require spatial arrangements in both dimensions, which is essential for contemporary web design practices.