If you’re worried about sensitive data leaving your corporate networks or computer systems, DLP can help. DLP software is designed to seek out sensitive data and enforce policies for handling it. Most DLP technology works via “deep content inspection,” which means it can read data to identify specific words, terms, or characteristics that indicate sensitivity. Some DLP tools can be “taught” to recognize words, phrases, and data formats that might indicate the presence of company-specific information, such as customer numbers.”]
Source: https://www.darkreading.com/analytics/what-you-really-need-to-know-about-data-loss-prevention