The phrase "internal purposes" refers to personal goals, desires or motivations that are held within oneself and not necessarily shared with others. Full definition
We may also use personal information for internal purposes such as auditing, data analysis, research, and to improve our products, services and customer communications. (HomeGauge.com)
For internal purposes including the professional development of firm lawyers and law clerks. (csllp.ca)
Personal information received from any visitor will be used only for internal purposes and will not be sold or provided to third parties. (the-positive-parenting-centre.com)