What is Data Loss Prevention (DLP)?

What it does

DLP products inspect data as it moves through an organization and enforce rules about where it can go. Core capabilities include:

• Scanning files, emails, and web traffic for sensitive content such as credit card numbers, social security numbers, source code, or health records
• Blocking or quarantining transfers that violate policy, for example uploading a customer database to a personal cloud drive
• Monitoring endpoint activity, including clipboard use, USB transfers, and print jobs
• Intercepting credentials or secrets before they are pasted into external tools such as AI assistants or large language models
• Generating alerts and audit logs for compliance reporting

Modern DLP tools extend into browsers, SaaS applications, and AI-facing surfaces. Some products mask or fragment data before it leaves a controlled environment rather than simply blocking transfers.

Why teams buy it

Regulatory frameworks including HIPAA, PCI-DSS, and GDPR require organizations to demonstrate that sensitive data cannot leave controlled systems without authorization. Beyond compliance, a single exfiltration incident can expose customer records, intellectual property, or credentials. DLP gives security teams visibility into where sensitive data travels and a mechanism to stop leaks before they become breaches.

What to look for

• Coverage: Does the product cover endpoints, network traffic, cloud storage, email, and browsers, or only a subset?
• Content inspection accuracy: Can it identify sensitive data in context, not just by file type or keyword?
• AI and browser coverage: Does it intercept data pasted into AI tools or browser-based applications?
• Policy flexibility: Can rules be tuned to reduce false positives without disabling protection?