DFARS stands for Defense Federal Acquisition Regulation Supplement. It is a set of regulations and guidelines issued by the U.S. Department of Defense (DoD) to supplement the Federal Acquisition Regulation Supplement (FARS). DFARS contains specific requirements and clauses that government contractors and subcontractors must follow when conducting business with the DoD. These regulations cover various aspects of procurement, contract administration, and compliance, with a focus on ensuring the security and integrity of defense-related acquisitions.