What defines the structure of a Sitecore page?

The structure of a Sitecore page is defined by the Sitecore layout. The layout determines how content is presented on a page by using a combination of components and placeholders. It acts as the blueprint for the rendering of content, dictating where different parts of the page will be displayed, such as headers, footers, and main content areas.

The layout is crucial because it provides a consistent framework across multiple pages, ensuring that all parts of the website adhere to a coherent design. This allows developers and content authors to focus on creating and managing content without needing to worry about the underlying structure each time.

Sitecore rendering, while related, specifically refers to the individual components that deliver content into the layout, rather than the overall framework defined by the layout itself. Item versioning pertains to managing different versions of Sitecore items, which is important for content management but does not define page structure. Media items are related to images, videos, and other assets but do not influence the structural layout of a page either.