The phases of the UPSC Civil Services Examination process consist of three main stages: the Preliminary Examination, the Mains Examination, and the Interview (Personality Test). The Preliminary is a screening test with objective-type questions; successful candidates proceed to the Mains, which features descriptive questions across various subjects. Qualified candidates from the Mains phase are then called for the Interview, assessing personality traits, intellect, and suitability for public service. Overall, each phase evaluates distinct skill sets crucial for a career in civil services.