A URL consists of different levels. What level is ".com" in the web address www.google.com?
To get a simple definition, a URL is the word that express your website's address. The words are later considered as the name of your website, which helps search engines such as Google, Bing, or any other engines to understand what your website's pages are about. The reason behind this is, when it was in the wild and wooly days of the early network or the Internet, finding and navigating the web was difficult and trickier than it is now. Computers that connected and corresponded within the webs were indicated by Internet Protocol Addresses (familiar with the name IP Addresses?), such as 192.168.8.8. Of course, if you wanted to advertise and promote your websites back then, you would have been in very difficult situation. I mean, how can people remember those numbers?
Then, a group of computer programmers and scientists developed something known as the Domain Name System or DNS. As the number of computers grow exponentially, it would be burdensome to people try to remember the IP Addresses. Hence, the scientists change the numbers into words, and humans are easily able to remember the words even though they are in a very long name. Furthermore, for the search engine, the change would be also easier for them to identify and navigate the web properties than those with numbers. This DNS name is later known as uniform resource locators (URL)
In a technical details, a URL consists of five parts, and they are the scheme, subdomain, top-level domain, second-level domain, and subdirectory. If you look at the address of this blog on your browser's url-bar, the address is
http://aeglephysics.blogspot.com/, or
https://aeglephysics.blogspot.com/search/label/Astronomy
The words are respectively explained as the five parts. To be precise, have a look on the picture below
The scheme tells web servers which protocol to use when it accesses a page on your website.
Nowadays, HTTPS - which stands for Hypertext Transfer Protocol Secure - is the most common scheme. It tells your web browser to encrypt any information you enter on the page, like your passwords, so cybercriminals can't access it. Also, this security protocol protects your website visitors and implementing it will help your site rank better on Google. That's why implementing SSL is a must-do in order to improve your website's pagerank.
So, for the website www.google.com?
Based on above explanation, encryption information could be defined as a language that communicates between browsers and servers of a website, thus; they need a prefix for doing that, and world wide web (www) is. Therefore, the "www" is the "scheme", and the "google" is "subdomain" and the ".com" is the top-level domain.
