These networks are connected by some standard network protocols, connecting billions of devices all over the world, and logically forming a single huge international network. It consists of millions of private, academic, corporate and government networks from local to global, which are connected by a series of extensive technologies such as electronic, wireless and optical fiber network technologies.
This method of connecting computer networks together can be called "network interconnection", and on this basis, a global Internet covering the whole world is developed, which is called the Internet, that is, a connected network. The Internet is not equivalent to the World Wide Web (WWW), which is just a global system based on hypertext links and one of the services that the Internet can provide.
The Internet has a wide range of information resources and services, such as interrelated hypertext documents, and the application of the World Wide Web, which supports the infrastructure of e-mail, peer-to-peer network, file sharing and IP telephone service.
Extended data
Internet operation principle
A computer network consists of many computers. In order to transmit data between computers in the network, two things must be done, namely, the destination address of data transmission and measures to ensure fast and reliable data transmission. This is because data is easy to be lost or transmitted incorrectly during transmission, and the Internet uses special computer language (protocol) to ensure that data can reach the designated destination safely and reliably.
This language is divided into two parts: TCP (Transmission Control Protocol) and? IP？ Of course, network marketing theory. Data transmission process of TCP/IP protocol: The communication mode adopted by TCP/IP protocol is packet switching.
The so-called packet switching simply means that data is divided into several segments during transmission, and each segment is called a data packet. The basic transmission unit of TCP/IP protocol is data packet. TCP/IP protocol mainly includes two main protocols, namely TCP protocol and IP protocol. These two protocols can be used in combination, and can also be used in combination with other protocols. In the process of data transmission, they mainly complete the following functions:
1. First, the data is divided into several data packets by TCP protocol, and the serial number is written for each data packet, so that the receiver can restore the data to the original format.
2.IP protocol writes the addresses of the sending host and the receiving host for each data packet. Once the source address and destination address are written, the packet can transmit data on the physical network. IP protocol also has the function of routing with routing algorithm.
Reference source Baidu Encyclopedia-Internet