Key themes in Indian society for UPSC include caste dynamics, gender issues, economic disparity, and environmental challenges. Issues like social justice, demographic changes, and political movements significantly shape societal narratives. Understanding these themes aids aspirants in tackling questions related to current affairs, socio-economic policies, and governance, which are pivotal in the exam. Additionally, concepts like globalization and cultural diversity are crucial for a holistic grasp of Indian society and can enhance answers in both prelims and mains.