National integration is vital in the context of UPSC studies, as it emphasizes the importance of unity among India’s diverse cultural, linguistic, and religious groups. Understanding this concept helps aspirants appreciate the complexities of governance and the need for inclusive policies that recognize the country's pluralism. UPSC preparation often involves exploring topics related to national integration, such as the role of the Constitution, social harmony, and the impact of regional differences on national unity. Embracing these concepts fosters a more cohesive society, essential for national development.