Final answer:
Sitecore's CMS pillar Presentation is supported by Layouts and components, which determine how the content is displayed on a website. Data templates and Items are related to content structure and storage, not directly to presentation.
Step-by-step explanation:
The Sitecore Content Management System (CMS) pillar, Presentation, is supported by Layouts and components. The presentation layer in Sitecore is responsible for determining how the content is displayed to the users. This is achieved through the use of Layouts, which define the overall structure of a page, and components (also known as sublayouts or renderings), which are used to build the visual and functional elements of a page.
While Data templates and Items are crucial parts of Sitecore's content management capabilities, they are more directly associated with the content definition and storage aspects of the CMS, rather than the presentation itself. Data templates define the structure and fields of the content, and items are the actual pieces of content stored within the CMS that utilize these templates.