An ACRO Police Certificate is often required for people who wish to emigrate or need a visa to live and work abroad.
The certificate details if you have a criminal record in the United Kingdom and is often required as part of the process obtaining a visa by a Consulate/High Commission. It will also include details of any foreign criminal history if it has been disclosed to UK authorities. Certificates also contain impending prosecutions and offences that may be under investigation.
The ACRO Criminal Records Office, who issue the certificates, are a national police unit. Founded in 2006 as the ACPO Criminal Records Office, the aim was to establish an operationally focused unit to organise the management of criminal records information and enhance the links between criminal records and biometric information.