Virtual Organisation Membership Service

The Virtual Organization Membership Service (VOMS) is an attribute authority which serves as central repository for VO user authorization information, providing support for sorting users into group hierarchies, keeping track of their roles and other attributes in order to issue trusted attribute certificates and SAML assertions used in the Grid environment for authorization purposes. (Retrieved from here, 2015-05-22).

More information on the GridPP VOMS can be found here.