If you are using Raspberry Pi for the first time and would like to access it via SSH, you first have to find out the IPv4 address. Cleverly,  Raspberry Pi displays its IPv4 address on the screen after the boot process, provided it is put into operation with the keyboard and screen. Unfortunately, the IPv4 address changes again and again, because the IPv4 address assignment by the DHCP server in the local network is not always assigned the same address, but dynamically any of its address pool.

If you use Raspberry Pi as a client, that’s no problem. But if you want to operate Raspberry Pi as a server within the local network or often want to access it via SSH, then a fixed IPv4 address is an advantage. Note here: You can also connect via the host name z. B. “raspberrypi.local” build. Only that does not always work.