GDPR is a European legislation that came into effect on May 2018. If you hold data on any person (including business-to-business contacts), you need to know about the rules governing the collection and use of personal data. This is important if your company holds personal data or if you use 3rd party data.  It is imperative that you only use Lists from a reputable source that makes sure every record is opted-in and compliant with ALL countries regulations.