Candidates can be appointed to various types of services through UPSC examinations, including the Indian Administrative Service (IAS), Indian Police Service (IPS), and Indian Foreign Service (IFS). Other services include Indian Revenue Service (IRS), Indian Audit and Accounts Service, and Indian Railway Traffic Service. Each service has distinct roles and responsibilities within the government structure, allowing candidates to pursue careers aligned with their interests and competencies. Understanding the nature of these services helps aspirants make informed choices during the selection of their optional subjects.