Communication refers to the transmission and exchange of information, and is an important means for people to connect and communicate with each other.

In communication, information is conveyed through various forms such as language, text, images, videos, etc. The purpose of communication is to enable the sender and receiver of information to understand and communicate with each other, in order to achieve information sharing and collaborative work. The communication system consists of a sender, a receiver, and a transmission medium. The sender is responsible for converting information into a communicable signal form, such as converting text into electrical or optical signals; The receiving end is responsible for restoring the transmitted signal to its original information form, such as converting electrical or optical signals into text. The transmission medium is a physical channel that connects the sending and receiving ends, such as cables, optical fibers, radio waves, etc.

Communication technology continues to develop and has undergone various forms and means of evolution. The ancient communication methods included simple methods such as letters, beacon fires, and drums, while modern communication uses various technological means such as telephone, telegraph, wireless communication, and satellite communication.

With the continuous development of Internet technology, Internet communication has become one of the main ways of modern communication. It has the characteristics of fast, convenient and efficient information transmission, which has greatly promoted the process of global informatization.

The essential difference between communication and network:
1. Purpose and essence: The core purpose of communication is to achieve information exchange and communication between people. The network, on the other hand, refers to a system formed by loosely combining many sites and interconnecting them through transmission media. Simply put, the network is a broad concept described in terms of functionality, which includes all hardware and software that exchange and connect data streams; Communication, on the other hand, is a specific concept described from a physical perspective, referring to services that require the transmission of sound, images, and other content. Therefore, we can consider the network as a form or tool of communication.

2. Channel of signal: Mobile network signal refers to the channel of network data, and the network signal of the mobile determines the speed of mobile internet access. The mobile communication signal refers to the channel of the call signal, and the mobile communication signal determines the quality of the mobile call.

3. The generation method of signals: Mobile network signals are a high-speed transmission technology in wireless environments, whose main idea is to divide a given channel into many orthogonal sub channels in the frequency domain, and transmit each sub carrier in parallel.

Mobile communication signals are high-frequency oscillating waves that encrypt sound waves and load them onto the high-frequency radio waves generated by the phone's own circuitry. After amplification, they are transmitted through an antenna to a nearby mobile base station.