The paper in the UPSC main examination focusing on the Indian language is the Indian Language Paper. This paper is designed to assess a candidate's proficiency in a selected Indian language, aiming to evaluate their comprehension, grammar, and language skills. It plays a critical role, as it contributes to the overall score and ensures that candidates appreciate India's linguistic diversity. Candidates can choose from a wide variety of languages listed by UPSC, allowing them to showcase their linguistic capabilities.