What is a URL?

A website address usually refers to the address of a web page on the Internet. Enterprises, institutions or individuals use technical processing to store some information on the Internet in a page-by-page manner. Each page has a corresponding address so that other users can access and obtain information. Such addresses are called URLs.

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The URL usually refers to the address of a web page on the Internet. The Internet URL is an important identifier of the Internet. You must enter the Internet URL to browse network information and run network application software.

Internet URLs vary with application content. To access the server, use an IP address or domain name address; to send and receive emails, use an email address; to access files on the network, use a file address.

The computer is a digital world. Any information is represented in a digital form in the computer. Even if a person's name is represented in the computer, there is a corresponding digital code corresponding to it. In the network world, in order to accurately find the destination computer, each computer must be marked with a unique address. Just like you must know the other party's phone number when making a call, this number must also be unique. Usually, this address is represented by four decimal (ie IPv4) numbers, separated by decimal points, called an IP address. IP is the abbreviation of Internet Protocol (Internet Protocol).

However, it is difficult for people to remember computer URLs represented by numbers, not to mention there are tens of millions of IP addresses on the Internet. In order to solve this problem, computers are represented by names that people are good at remembering. In order to ensure the uniqueness of computer identification on the Internet, one solution can be to use centralized naming and management. There is only one organization on the entire Internet responsible for this work. Obviously, this solution is unrealistic. Therefore, the Internet provides a naming mechanism called the domain name system. A URL named using the domain name system is a domain name address. The domain name address is expressed hierarchically, with cn for China, us for the United States, the server category on the far left, and www indicating that this computer is a Web server.

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