The UPSC Mains examination holds significant importance as it is the decisive stage for evaluating a candidate's expertise and suitability for civil services. Unlike the prelims, the Mains consist of descriptive-type questions, assessing candidates' analytical and critical thinking abilities through various subjects, including Essay, Indian Heritage, and Public Administration. The Mains scores carry substantial weight in the final selection process, allowing for in-depth assessment of a candidate’s knowledge, clarity of expression, and writing skills, essential for effective governance and administration.