What are "Frontend modules" in Liferay?

Frontend modules in Liferay refer to reusable components that encapsulate both functionality and styling. This concept aligns with the modern approach of building user interfaces where individual pieces of the UI, such as buttons, forms, or entire sections of pages, can be developed and maintained independently.

These modules typically consist of a combination of HTML, CSS, and JavaScript, allowing developers to create dynamic and interactive user experiences. By promoting reusability, frontend modules simplify the development process, enabling developers to use the same components across different parts of the application without rewriting code.

In contrast, the other options describe various elements not directly related to the concept of frontend modules. Large pre-built themes generally focus on design rather than the modular functionality aspect. Scripts that manage backend processes are involved in server-side logic, which is separate from the frontend concerns. Finally, monitoring tools for site performance are related to analytics and optimization rather than creating or managing frontend user interface components.