What Is Domain name?
Domain name is a human readable website adress eg https://hassa2bit.com;
In the URL above, hassan2bit is the domain name, and it could also be denoted as the second level domain, While the .com would be the top level domain.
As i mentioned above, The domain name is a human readable site adress, the way the computer actually locate a website is through the IP adresss, represented as four sets of numbers, separated by periods, For example: 192.168.1.1 or 172.20.10.4.
If you'd like to check the IP adresss of any site such as google, amazon etc, you could head over to nslookup.io.