Cross Domain Solutions (CDS) are specialized tools, technologies, and processes designed to securely enable the transfer, access, or sharing of information between networks or systems operating at different security or classification levels. CDS are critical in environments where sensitive or classified data must be exchanged without compromising security, such as in government, military, or critical infrastructure sectors. They enforce strict policies and controls to prevent unauthorized data leakage, ensuring that only permitted information passes between domains. CDS solutions often include hardware and software components, and are subject to rigorous certification and accreditation processes to meet stringent security requirements. Their use helps organizations balance the need for information sharing with the imperative to protect sensitive assets.