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Many changes have been made in different sciences by developing and advancing information and communication technology in the last two decades. eHealth is a very broad term that includes many different activities related to the use of electronic devices, software as well as hardware in health organizations. The extent to which health professionals are using electronic devices as source information about health and medicine is rapidly increasing. It has been reported by healthcare professionals that large numbers of patients refer to physicians either with questions related to online medical information or a large variety of health products on the Internet. World Health Organization defines eHealth to describe the combined use of electronic communication and information technology in the health sector or the application of digital data-transmitted, stored and retrieved electronically-for clinical, educational and administrative purposes, both at the local site and at a distance. The preceding definition of eHealth is broad enough to apply to the dynamic environment of the Internet and at the same time acknowledge that eHealth encompasses more than just "Internet and Medicine". Indeed, strategists and policy makers of health sector can make processes of planning, delivery and evaluation of health care more efficient and effective, by taking advantage of the various capabilities of information and communication technologies and planning processes. In this article we will explain the worth of electronic health and at the next stage; we will discuss about the different works done in different countries about the eHealth. Classification of countries is based on the division of the WHO. These countries are chosen from America, Africa, Southeast of Asia, Europe Region, Western Pacific and the Eastern Mediterranean. [ABSTRACT FROM AUTHOR]