Telehealth is the delivery of various types of health care when patient and provider are geographically separated — it can involve video conferencing, telephone calls, electronic data transmission, and other ways of communicating over the Internet. With many rural and remote areas in Canada, telehealth promises to bring health care to communities that are otherwise underserved. But how do these technologies and programs compare to standard care? Are the patients being well served? Is there evidence of telehealth’s effectiveness? CADTH has produced a number of Rapid Response and other reports that attempt to answer these questions.