Which HTML element is often used to create structured layouts on a web page?

The choice of Div as the correct answer highlights its significance in structuring web layouts. The Div element is a block-level container that allows developers to group content and apply styles or scripts effectively. It doesn’t convey any semantic meaning by itself, which gives developers the flexibility to use it purely for layout purposes. This means it can be styled with CSS to control positioning, size, and other visual properties, making it a fundamental tool for creating complex, grid-based layouts in web design.

While elements like Header and Footer serve specific semantic purposes—defining the top and bottom of a webpage or section respectively—they are not as broadly applicable for all layout needs as Div is. The Section element is also used to group related content, but it conveys semantic meaning and is intended for thematically related content rather than general layout structuring. Thus, for purely creating responsive and adaptable layouts, Div remains the most versatile choice.