What functionality does the Lightning App Builder provide?

The Lightning App Builder provides a drag-and-drop interface for creating and customizing pages, making it a powerful tool for users who want to design applications without deep technical knowledge. This feature allows users to easily add components, such as records, lists, charts, and custom components, onto the pages they create for Salesforce applications. The intuitive nature of this interface enables rapid development and customization of user experiences, fostering a more agile approach to application design.

The ability to visually arrange components through drag-and-drop functionality significantly enhances productivity. Users can see a real-time layout preview as they design, which facilitates collaboration and immediate feedback within teams. This empowers business users and administrators to rapidly adjust their apps according to changing business requirements without relying heavily on development resources.

The other options do not align with the core functionality of the Lightning App Builder. For instance, while the tool allows for designing layouts, it does not provide comprehensive graphic design tools. Similarly, it is not an API for external integrations nor a code editor for developing custom components, as those functionalities are offered through different Salesforce tools and environments, such as Salesforce DX or development environments specifically built for coding.