What is the primary purpose of the "liferay-ui:message" tag?

The primary purpose of the "liferay-ui:message" tag is to retrieve localized messages for internationalization. This tag is an essential tool for developers working in Liferay, allowing them to access specific messages defined in language properties files. By utilizing this tag, developers can ensure that their applications are user-friendly across different languages and cultures, enhancing the accessibility and reach of their applications.

When a developer uses the "liferay-ui:message" tag in a JSP file, it dynamically fetches the appropriate localized string corresponding to the user's language settings. This functionality is crucial for global applications, as it allows for seamless content adaptation to various locales, thereby improving the user experience without the need for hardcoding text.

Other options do not relate to the primary functionality of the "liferay-ui:message" tag. Creating custom UI components, defining page layout structure, and managing user sessions pertain to different aspects of application development in Liferay and are handled by other tags or methods within the platform.