An essential document for candidates to apply for UPSC examinations is the Online Application Form. This form requires candidates to provide personal information, educational qualifications, and details regarding the examination they intend to appear for. Completing this application accurately is vital for securing a spot in the examination process. Furthermore, additional documents like a valid identity proof, educational certificates, and photographs may also be required during submission. Timely and correct submission of the application is critical for aspirants to participate in the rigorous selection process.