What do Sitecore Layouts define?

Sitecore Layouts define the overall structure of a webpage, serving as templates that dictate how content is organized and displayed on the front-end. By using layouts, developers can control which components are rendered, their arrangement on the page, and the overall appearance of the site. This facilitates a consistent look and feel across different pages and makes it modular, allowing for updates and changes without altering the entire site structure. In Sitecore, layouts are a critical part of the presentation layer, enabling content authors to focus on content while ensuring that the design and structure remain intact. This is essential for maintaining a cohesive user experience across a Sitecore-driven website.