The UK Data Archive is a national centre of expertise in data archiving in the United Kingdom (UK). It houses the largest collection of digital data in the social sciences and humanities in the UK. It is certified under the Data Seal of Approval as a trusted digital repository. It is also certified under the international ISO 27001 standard for information security.Located in Colchester, the UK Data Archive is a specialist department of the University of Essex, co-located with the Institute for Social and Economic Research (ISER). It is primarily funded by the Economic and Social Research Council (ESRC) and the University of Essex.