The UPSC selection process involves several critical steps, beginning with the preliminary examination, followed by the mains examination, and concluding with the interview stage. The preliminary exam serves as a screening test, consisting of objective-type questions assessing candidates' general knowledge and aptitude. Those who qualify then participate in the mains exam, which includes descriptive papers covering various subjects. Successful candidates from this stage proceed to the final interview, where personal traits and communication skills are evaluated. The entire process emphasizes merit and aims to select candidates suited for public service responsibilities.