Because all the network devices are using the same TCP/IP protocol to communicate to each other. They must have a unique address to distinguish from the other. That address is called IP address.
Now we have two version of the IP addresses: IP version 4 (IPv4) and IP version 6 (IPv6). Although IPv4 is supposed to end soon because it supports only 2^32 = 4.3 billion addresses, it is still widely used until now because of the NAT.
The Network Address Translation allows us to use any Private IP addresses and translate them into Public IP Address(es) in order to communicate to the internet (Public IP Addresses).
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