What is the primary purpose of Application Display Templates (ADTs)?

The primary purpose of Application Display Templates (ADTs) is to display dynamic data in markup. ADTs allow developers to define how content is presented on the user interface, utilizing dynamic data that is sourced from various applications within the Liferay platform. This capability enables the creation of custom layouts and presentations that can adapt to different types of content and contexts, thus enhancing the way content is visualized.

By using ADTs, developers can tailor the markup (HTML) and styling (CSS) based on the specific requirements of the content being displayed. This flexibility supports a rich user experience by allowing for the integration of various data sources and the customization of layouts without the need to modify the underlying business logic.

The other options address different functionalities in Liferay. Structuring web content and creating page fragments involve organizing and segmenting content but do not capture the essence of dynamically displaying that content. Managing site administration pertains to the operational aspects of the Liferay portal rather than how content is presented, which is not the focus of ADTs.