The various categories of services for which UPSC recruits candidates include the Indian Administrative Service (IAS), Indian Police Service (IPS), and Indian Foreign Service (IFS). Additionally, the UPSC also recruits for various Group A and Group B services under the central and state governments. Some notable services include the Indian Revenue Service (IRS) and the Indian Audit and Accounts Service. Each of these services has distinct responsibilities and requirements, impacting candidates' career paths post-selection.