Discuss the role of ETL (Extract, Transform, Load) processes in data warehousing. Provide a detailed explanation of each phase and its importance. Illustrate your answer with examples of common tools used in ETL and the challenges that may arise during these processes.

The JSP Standard Tag Library (JSTL) is a collection of ready-to-use tags that encapsulate the core functionalities commonly needed in JSP-based web applications. It helps simplify the development process by reducing the need for embedded Java code within JSP pages. JSTL is part of the Java EE platform and promotes a cleaner separation of business logic from presentation.

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