A death certificate confirms that a person is deceased by containing details about their death and personal information. The certificate must be attested by the relevant authority through applying a seal and signature to prove its authenticity. Death certificate attestation is required to use the certificate for legal purposes like insurance claims or settling a deceased's estate, as well as proving that an individual has passed away. The certificate needs to be attested so it can be used in other countries by submitting the original certificate and a passport copy for verification and approval by the country's embassy.