Apache Tiles refers to a web application framework used to define reusable page layouts and common interface elements. It is applied in software development to organize application pages into consistent templates, helping separate page structure from page content. Apache Tiles is used to simplify the maintenance of web interfaces by allowing shared components to be managed in one place.

Grails is an open-source web application framework based on the Groovy programming language. It follows the model-view-controller (MVC) architectural pattern and allows developers to build web applications rapidly by providing a set of pre-built features and plugins. Grails supports various databases, security features, and testing tools that help developers build scalable and secure web applications. It is widely used in the Java community and has gained popularity due to its ease of use, flexibility, and productivity. Grails developers should have a strong understanding of MVC architecture, Groovy, and Java to build efficient web applications.

Java Web Start is a technology used to launch and manage Java-based applications directly from the web without the need for complex installation processes. It provides users with easy access to applications and updates, as well as enhances security and facilitates offline usage. Consequently, proficiency in Java Web Start involves designing and deploying Java applications compatible with the technology while adhering to the relevant coding standards and practices.

The JavaServer Pages Standard Tag Library (JSTL) is a collection of useful JSP tags and functions for web application development in Java. It provides a set of standardized tags to simplify and streamline the creation of web pages, allowing developers to focus on the business logic rather than the presentation layer. JSTL includes tags for controlling flow, accessing data, manipulating XML documents, and handling internationalization, among other tasks. It is a valuable tool for Java developers who want to create dynamic, data-driven web applications.

Liferay is a web-based open source platform that provides a comprehensive framework for building digital experiences, including portals, websites, intranets, and social collaboration solutions. The platform features customizable themes, drag-and-drop page editors, workflow management tools, document and content management systems, and many other features. Liferay is used by enterprises, government agencies, and non-profit organizations to create and manage digital experiences, with special emphasis on user engagement and interactivity. Proficiency in Liferay development requires expertise in programming languages such as Java and JavaScript, as well as an understanding of web development frameworks and methodologies.