A cross-domain solution (CDS) is a means of information assurance that provides the ability to manually or automatically access or transfer information between two or more differing security domains.

A cross-domain solution (CDS) is a means of information assurance that provides the ability to manually or automatically access or transfer information between two or more differing security domains.[1] They are integrated systems of hardware and software that enable transfer of information among incompatible security domains or levels of classification