The significance of the UPSC interview stage lies in its role as a critical assessment of candidates beyond written examinations. During the interview, aspirants showcase their personality, communication skills, and depth of knowledge. This stage helps evaluate attributes like leadership, integrity, and decision-making abilities, which are vital for civil services. It also allows the panel to assess candidates' confidence and ability to think on their feet. A strong performance in the interview can differentiate candidates with similar academic backgrounds, making it a decisive factor in the selection process.