website
A webpage, also known as a web page, is the basic element of a website. A webpage connects multimedia information such as text, graphics, sound, and animation, and is generally composed of a site logo, navigation bar, advertisement bar, information area, and copyright area. A website is a collection of related web pages in the form of hyperlinks on the Internet.
domain name
A domain name is the identity of a web page on the Internet. The URL we enter when we open a web page is called a domain name. For example, if we want to enter the official website of the host baby, enter www.google.com in the browser, this string of letters is the domain name of the web page, representing the address of the web page on the Internet.
IP address
The domain name mentioned above is equivalent to the intermediary for users to access web pages. By accessing the domain name, what people access is actually the IP server address corresponding to the domain name. By exchanging information with the server, they complete the need to access the website.
Therefore, each domain name corresponds to an IP address, and its conversion is realized through DNS (Domain Name Resolution System). When a user visits a website, he actually accesses the domain name address, and finally accesses the IP server corresponding to the domain name, and exchanges information with it.
Notice:
There is not a one-to-one correspondence between IP addresses and domain names, and one IP address can correspond to many domain names. That is to say, visitors can access the same page through multiple different URLs, and the website administrator only needs to resolve these domain names to the same IP address.
Conversely, a domain name has only one IP address in theory. In recent years, due to the emergence of CDN (Content Delivery Network), the IP address resolved from the same domain name in various places seems to be different, but in fact it is still the original IP address. CDN is actually a combination of a load balancer and a caching mechanism. In order to improve the efficiency of website access, when users in different regions access the same website, the DNS system with CDN will automatically select the CDN server closest to the access end to process the website. The domain name is resolved to obtain the IP address, but this address is cached from the original address, so it is still the same IP address.
