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Welcome to eGyanKosh’s resource hub for Unit-13 of the IGNOU (Indira Gandhi National Open University) curriculum for 2025. Here, you will find comprehensive study materials designed to enhance your understanding of external services in various contexts. Our goal is to provide you with accessible and high-quality educational resources that can be freely downloaded, enabling you to study at your own pace and convenience. Whether you’re preparing for exams or seeking to deepen your knowledge, our carefully curated content will support your learning journey and ensure you’re well-equipped for academic success. Dive in and explore the wealth of information available to help you excel in your studies!