To obtain an Unmarried Certificate in Delhi for visa and immigration purposes, you need to visit the Sub-Divisional Magistrate (SDM) office in your area. Complete the prescribed application form and submit required documents such as proof of identity (Aadhar card, passport, etc.), address proof, passport-sized photographs, and in some cases, a notarized affidavit declaring your unmarried status. The SDM will verify your details, and after the verification process, the certificate will be issued. The processing time may take a few days to a couple of weeks. Ensure all documents are accurate to avoid delays in obtaining your Unmarried Certificate in Delhi.