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First time doing a function script and I am getting an error. Anyone knows the problem?

#!/bin/bash
hello()
{ echo "Executing function hello"
}
echo "Script has started now"
hello
echo...

I'm trying to understand this code. I want to know when I execute the code how come this code outputs
"nameserver 192.168.168.2 search lan"?
There is no "cat /etc/resolv.conf" in the code so why...