What are the modern ways of communication?

On the basis of physical delivery, although fewer and fewer people write letters now, the simpler and truer, the simpler and truer. Letters are the simplest and purest way to transmit information, not to mention the overflow and leakage of information caused by too fast transmission.

(2) telephone

Telephone can be divided into fixed telephone, mobile telephone and network telephone, and its transmission mode is basically the same as that of network, but the difference from network mode is that telephone can not directly transmit words and pictures, and the difference from postal mode is that it can not transmit physical objects.

(3) Fax

Fax is the fastest-growing non-telephone telecommunication service in recent twenty years. Still images recorded on paper, such as words, charts, photos, etc. , scanned and converted into electrical signals, and transmitted to the destination through various channels. At the receiving end, through a series of inverse transformation processes, a communication method similar to sending the original is obtained, which is called fax.

(4) Telegram

Telegrams are written messages transmitted by electrical signals. Today, with the rapid communication, the function of telegraph is not very great. Maybe one day telegrams will disappear from our lives.

(5) Satellite phone

The telephone that transmits information based on satellite communication system is a satellite telephone. Satellite phone is the product of modern mobile communication. Its main function is to fill the areas that can't be covered by existing communication terminals (wired communication and wireless communication) and provide better services for people's work.