Nightfall AI is a cloud-native data loss prevention (DLP) and insider risk management platform. It uses AI and machine learning to detect, classify, and block sensitive data — PII, credentials, intellectual property, PHI — as it moves across SaaS apps (Slack, Google Drive, GitHub, Salesforce, Zendesk), email, browsers, endpoints, and generative AI tools like ChatGPT, Copilot, and Claude. Unlike legacy DLP that relies on static pattern-matching and rule sets, Nightfall's AI-native detection understands context and behavior, not just file content. Its flagship agentic product, Nyx, acts as an autonomous DLP analyst: it investigates alerts, surfaces behavioral patterns, tunes policies, and reduces analyst alert fatigue automatically. The platform also offers a Human Firewall feature and real-time browser-level enforcement to block data from leaking through AI browsers and shadow AI tools. Buyers are security and compliance teams at enterprises — from AI-native companies to top-10 banks — that need to govern data across a sprawling, cloud-first, GenAI-heavy environment without deploying heavy proxies or agents.