Question: 
What is public health informatics?
Answer: 

Public Health Informatics has been defined as “the systematic application of information and computer science and technology to public health practice, research, and learning.”1 At PHII, we think of it as the tools and practices that enable public health practitioners to apply information effectively to improve health outcomes.

1W. A. Yasnoff, P. W. O’Carroll, D. Koo, R. W. Linkins and E. M. Kilbourne, “Public Health Informatics: Improving and Transforming Public Health in the Information Age.” Journal of Public Health Management and Practice, 2000, 6(6), 67–75.