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Public IP address can be static or dynamic. Static public IP address does not change and it is mainly used for accessing a service (such as an IP camera, FTP server, email server or remote access to the computer) or web hosting on the Internet. It has to be bought from ISP.
Dynamic IP address, on the other hand, receives the IP address available and changes every time it is connected to the Internet. The maximum Internet user has a dynamic IP address for his computer, which is disconnected when disconnected from the Internet and gets a new IP address when reconnected.