Secure, cloud-based document repositories designed for sharing confidential financial, legal, and corporate documents during high-stakes transactions — M&A due diligence, capital raises, audits, IPO preparation, and board reporting. Core capabilities include granular permission controls (view, download, print restrictions per user/group), dynamic watermarking, document indexing and full-text search, Q&A workflow management, activity tracking and audit trails, and compliance certifications (SOC 2, ISO 27001). The category spans enterprise VDR platforms (Intralinks, Datasite/Merrill, Firmex) and modern alternatives (Ansarada, DealRoom, SecureDocs) that emphasize usability and AI-powered analytics.