Oman is one of the oldest independent state in the Arab world and also a traditional country in the Arab world. On behalf of the request of residents and immigrants who lives in Oman, the government provides a police certification to them is called a Oman PCC. A police clearance certificate is the only proof which shows that you are not included in any crime records. If you have a criminal background attestation is not possible for your documents. So PCC is the only proof to show your genuine character.