What are the three major networks in the world today?

As of June 2020 165438+ 10, the three major networks in the world are telecommunication network, internet and radio and television network.

The traditional telecommunication network (telephone network) adopts circuit switching, which can realize one-to-one, two-way and real-time connection between any two users, and is mainly used to carry voice services. Because each user occupies a separate communication link, this communication mode is obviously personalized and real-time.

The charging and management mechanism of telecommunication network is more urban and perfect. Although the traditional telecommunication network has a huge user base, it is not suitable for the transmission of big data because of its narrow link bandwidth, low utilization rate and complex connection signals.

Internet adopts packet switching based on store and forward, which mainly carries data communication services. The connection between users can be one-to-one or one-to-many points.

Extended data:

Internet function application:?

1, online media?

Internet is the main carrier system of media today. Because of its huge information enjoyment, almost all news websites and enterprise portals are now publicized through the Internet. ?

2. Network communication?

I can think of instant messaging. Yes, instant messaging is the most indispensable function of the Internet now. It allows two people who are thousands of kilometers apart or even halfway across the planet to share information in time. Of course, non-instant communication such as email is also very important, especially in the work and study environment. ?

3. Information retrieval?

In the information age, there is almost all information on the Internet. In such a vast amount of information, as long as we use the Internet, we can quickly find the information we need, that is, through one or two keywords, we can quickly and accurately find the information that is helpful to us. ?

4. E-commerce?

E-commerce is a rapidly developing form of Internet in recent years. Internet users use the Internet to conduct online transactions. In a safe environment such as online payment and online transaction, face-to-face communication between sellers and buyers can be omitted and product transactions can be realized.