How are themelets utilized in the context of Liferay theming?

Themelets are an important aspect of Liferay's theming system, allowing developers to create modular and reusable pieces of design that can be integrated across multiple themes. This ability to share design components enhances consistency and efficiency in theme development. By utilizing themelets, developers can build a library of components that can easily be applied to various themes, ensuring a unified look and feel while also streamlining the development process.

The integration of themelets across several themes means that a change made to a themelet can automatically propagate to all themes using that particular themelet. This helps in maintaining coherence across different parts of a site and simplifies updates and maintenance in a live environment.

The other concepts, such as themelets being optional and not affecting performance or being specific to one theme, do not accurately represent the role of themelets in Liferay. Themelets are designed to promote reusability and alignment across multiple themes rather than being isolated components.