What is the primary feature that enables Web Content Management (WCM) in Sitecore?

The primary feature that enables Web Content Management (WCM) in Sitecore is known as Sitecore Experience Manager. This component is designed specifically to facilitate the creation, management, and optimization of content across multiple channels. Experience Manager provides the tools and interface necessary for content authors and marketers to edit and publish content seamlessly, allowing for a cohesive management experience across different digital touchpoints.

The other choices focus on different aspects of Sitecore's capabilities. Experience Analytics pertains to the data insights and metrics related to user interactions and content performance, and while it is important for understanding user engagement, it does not directly manage content. Experience Management generally refers to a broader strategy that encompasses various Sitecore functionalities, but it lacks the specific tools that the Experience Manager provides. Lastly, a Content Delivery Network is a mechanism for delivering content efficiently to users based on their geographic location, but it does not play a role in the actual creation or management of content itself. Thus, Sitecore Experience Manager is the correct answer as it is integral to the WCM functionalities within Sitecore.