How does Sitefinity enable the modification of existing content easily?

Sitefinity facilitates the modification of existing content primarily through direct page visual editing. This feature allows users to interact with the content in a more intuitive and user-friendly manner. The visual editing interface lets content editors see the changes in real time as they edit the content directly on the page, rather than through a separate backend interface. This approach streamlines the content management process and makes it easier for non-technical users to make updates to text, images, and layout without needing to understand the underlying code or complex workflows.

The other options do not effectively impact the ease of modifying existing content. A coding interface would require technical knowledge, which could be a barrier for many users. Restricting content edits to administrators could lead to bottlenecks and slow down the content update process, limiting flexibility and responsiveness. Relying solely on periodic updates suggests a lack of immediacy and ongoing content management, which does not address the need for on-the-fly edits that visual editing provides.