The IP address is the address of each connected PC.

Domain name or domain name system is a core service of the Internet.

1. IP address:

IP address is used to give a number to computers on the Internet. What we see every day is that every connected PC needs an IP address in order to communicate normally. We can compare "personal computer" to "a telephone", then the "IP address" is equivalent to the "telephone number", and the router in the Internet is equivalent to the "program-controlled switch" of the telecommunications bureau.

The IP address is a 32-bit binary number, which is usually divided into 4 "8-bit binary numbers" (that is, 4 bytes). IP addresses are usually expressed in dotted decimal notation (a.b.c.d).

Among them, a, b, c, and d are all decimal integers between 0 and 255. Example: The dotted decimal IP address (100.4.5.6) is actually a 32-bit binary number (01100100.00000100.00000101.00000110).

2. Domain Name

Domain Name System (DNS, Domain Name System, sometimes referred to as domain name) is a core service of the Internet. It can combine domain names and IP addresses. A distributed database that maps each other can make it more convenient for people to access the Internet without having to remember a string of IP addresses that can be directly read by machines.

The domain name resolution service was first invented by Paul Mocapejos in 1983; the original technical specifications were published in Internet Standard Draft No. 882 (RFC 882).

Drafts 1034 and 1035 issued in 1987 revised the DNS technical specifications and repealed the previous drafts 882 and 883. Subsequent revisions to the draft Internet standards basically did not involve changes to the DNS technical specifications.