Answer Description
A server needs to be accessed at all times, with outages kept to a minimum. Using anything but static IP addresses will cause issues when clients attempt to access the server. If the Ip changed, the network and clients will have to learn about the change.
Wikipedia
An IP address (abbreviation of Internet Protocol address) is an identifier assigned to each computer and other device (e.g., printer, router, mobile device, etc.) connected to a TCP/IP network that is used to locate and identify the node in communications with other nodes on the network.
Version 4 of the Internet Protocol (IPv4) defines an IP address as a 32-bit number. However, because of the growth of the Internet and the depletion of available IPv4 addresses, …
IP address - Wikipedia, the free encyclopedia