In the last decade, many advances have been made in the development of telemedicine technology as a method of telemedicine care supported by modern digital media communications. In many countries, the medical care system is getting closer to the patient. Especially telemedicine in countries such as Iran where the transportation network is less developed, the dispersion of the population in some parts of the country and mountainous and impassable areas, lack of access to specialized medical centers in many parts of the country and the aging population and Requires intensive medical care, helps a lot in diagnosing the disease quickly, adopting the right treatment tactics, reducing time wasting (which in some cases is as vital as heart disease) and reducing related costs (direct and indirect). The relentless growth of technology and public access to communication and computer systems has opened new horizons in medical science and made the impossible possible..

The use of medical information by communication tools to provide health, medical care or patient education with the aim of improving the patient's status is called telemedicine, and therefore definition, teletherapy can be the treatment of patients with telecommunications using information and communication technology and with The goal is to increase the quality of treatment and reduce its costs. The necessity of using telemedicine system and teleotherapy in the following cases is clear:

- On the ship
- On the plane
- In war zones
- In prisons and remote areas
 

Given that it is difficult to have specialized and experienced physicians in the above places, it is necessary to use a method to benefit from the experience and knowledge of specialists in these areas. On the other hand, in many cases, people usually see a doctor a few days or weeks after the onset of symptoms due to occupations or other causes, so the disease may become more advanced and more difficult to treat. So if medical services are more easily provided to people in any way, it can be effective in avoiding this problem. Given these points, telemedicine and subsequent teleotherapy can make a significant contribution to the promotion of public health. Of course, it should be noted that equipment related to the telemedicine system and teleotherapy are expensive and in some cases their use is not cost-effective. But further advances in technology will make access to telemedicine facilities and teleotherapy cheaper and more common.

Communication in a telemedicine system is usually done in two general ways:
Simultaneous communication: involves a direct conversation over the telephone, videoconferencing, or a web page. During this type of communication, the patient should pay full attention to the issues raised at the same time.
Asynchronous communication: takes place via e-mail and the like. In this case, it is possible to use time more efficiently and flexibly.

According to the above, telemedicine is done in several ways according to the type of communication:
- Real-time video communication
- Save and send
- Health care and home monitoring

The most common method of telemedicine is through real-time video communication, which uses video conferencing equipment and special imaging aids such as endoscopes, and audio aids such as electrical medical earphones and transmission lines of appropriate capacity.

In the method of saving and sending the summary, the subject is written in text. For example, in the form of e-mail, the image, or if necessary, the video is taken with a camera or digital video camera. The item will be sent to the health center by e-mail. The relevant specialist at the center examines the issue and provides the necessary answer to the patient or those around him.
The increase in chronic diseases on the one hand and the tendency to reduce the length of hospital stay and its exorbitant costs on the other hand, has increased the tendency to care for patients at home. From a telemedicine perspective, there is the possibility of a quick connection between the hospital and the home where the patient is hospitalized and cared for. Internet and web facilities can be used for this purpose. In addition, with the advancement of technology, portable electronic devices for measuring blood pressure, blood glucose, respiration rate and vital signals are available to the public. This can help with health care through remote medical systems.

Telemedicine is also used for home monitoring of critical parameters. In this way, the vital parameters of the person at home are recorded by measuring devices and sent to specialized clinical centers. Cardiac arrhythmia monitoring, blood glucose monitoring of diabetic patients to control their blood sugar, connected to a computer, weight monitoring in slimming diets Asthma control using personal Peak Flow Meter are common examples of monitoring physiological parameters through the remote medical system.

The telemedicine system provides home care for patients with heart failure. Continuous monitoring of the condition of patients with heart failure increases their life expectancy. Web-based applications are used to connect patients at home and to physicians or nurses in specialized clinical centers. For this purpose, weight, blood pressure, vital signs and signals are monitored.

In medicine and telemedicine, there is a two-way balance between the specialist doctor and the patient or those around him. The process of two-way communication, including taking patient data, transferring data, and providing the patient with the answer to a problem, is called equilibrium. According to this issue, the main components required by the telemedicine system are as follows:
- A device for receiving information
- A device for transmitting information
- A device for displaying information The
placement of these tools in sequence and function They correctly determine the hardware required for the telemedicine system.