How is a custom service created in Liferay?

Creating a custom service in Liferay is primarily achieved through the implementation of service interfaces or by utilizing the Service Builder tool. Service Builder is a powerful framework that helps developers generate service implementation code, persistence layers, and other elements necessary for a custom service. When you use Service Builder, it streamlines the process of creating services that can interact with the database, manage business logic, and provide an API that can be consumed by other parts of the Liferay ecosystem.

Additionally, by implementing a service interface, developers can define the functions that the service will expose, which allows for better modularity and reusability of the service throughout the Liferay platform. This approach is essential for ensuring that custom services can be efficiently integrated into Liferay's architecture, offering full compatibility with Liferay's features and capabilities.

In contrast, using a pre-built service from Liferay's library does not allow for customization tailored to specific business requirements, leaving developers constrained by the capabilities of existing solutions. Configuring settings in the Control Panel relates more to administrative tasks and site management rather than creating new services. Editing the site layout directly focuses on the visual presentation of content and does not involve the underlying service creation process, which is more technical in nature. Thus, the correct method for