kali linux why when i write ping www.google.com unknown host error. And when I write ping 8.8.8.8. The error appears the network is inaccessible. And when I write ping 0.0.0.0, it works ?? What is the difference between them and what do I do to fix it?

root@kali: File Edit View Search Terminal Help root@kali:-# ping www.google.com ping: unknown host www.google.com root@kali:-# ping 8.8.8.8 connect: Network is unreachable root@kali:-# ping www.this website_does not exist.com ping: unknown host www.this website_does not exist.com root@kali:-# ping 0.0.0.0 PING 6.0.0.0 (127.0.0.1) 56(84) bytes of data. 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.113 ms 64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.027 ms 64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.026 ms 64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.023 ms 64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.023 ms 64 bytes from 127.0.0.1: icmp_seq=6 ttl=64 time=0.029 ms 64 bytes from 127.0.0.1: icmp_seq=7 ttl=64 time=0.032 ms 64 bytes from 127.0.0.1: icmp_seq=8 ttl=64 time=0.023 ms 64 bytes from 127.0.0.1: icmp_seq=9 ttl=64 time=0.023 ms 64 bytes from 127.0.0.1: icmp_seq=10 ttl=64 time=0.025 ms 64 bytes from 127.0.0.1: icmp_seq=11 ttl=64 time=0.025 ms 64 bytes from 127.0.0.1: icmp_seq=12 ttl=64 time=0.029 ms 64 bytes from 127.0.0.1: icmp_seq=13 ttl=64 time=0.029 ms 64 bytes from 127.0.0.1: icmp_seq=14 ttl=64 time=0.023 ms 64 bytes from 127.0.0.1: icmp_seq=15 ttl=64 time=0.021 ms *C