This document discusses information communication technology (ICT) in e-health systems. It defines e-health as the use of ICT for health, including providing access to health information and records. The document outlines how ICT improves relations between patients and health services and facilitates communication. It also discusses some e-health related services like electronic medical records and prescriptions. Finally, it discusses challenges to developing e-health in India and defines consumer informatics and medical/clinical informatics as areas of health informatics.