Telemedicine is defined as the study of a telecommunication and information technology to contribute clinical health care from a span. It has been used to overcome distance barriers and to improve a medical service which is often not being consistently available in rural communities. Telemedicine is also used to save lives in emergency situations and critical care.
Although there were distant precursors to telemedicine, it is essentially a product of 20th century X information technologies and information technologies. These technologies permit communications between patient and medical staff with both convenience and fidelity, as well as the transmission of medical, imaging and health informatics data from one site to another.
Early forms of telemedicine achieved by telephone and radio have been supplemented with video telephony, advanced diagnostic methods supported by distributed client/server applications, and additionally with telemedical devices to support in-home care.