A common URL looks like this www.blurtit.com . Now this URL can be divided into four main branches http://, www, blurtit, com. Each part of the URL are described below.
Http stands for hyper text transfer protocol. It is the internet protocol used to help the internet traffic to communicate with each other. There are other types of internet protocol are also available such (FTP, IP etc).
Www stands for world wide web. It indicate the network you are going to login into.
3. Domain Name (blurtit in this example)
This is the name of the website we choose at the time of registration. You can register any name subject to the availability of domain name. If the domain name is owned by some one else, then you can not register it again.
The com is short for commercial. This part of the URL shows the type of the websites the URL represents. For example if the University launches its websites, then the URL should look like www.someuniversity.edu . The edu means "Educational" so this is more meaningful than www.somuniversity.com because university provides its services in Education. A Network company site might look something like this www.myinternetcompany.net . The net at the end of URL specify the type of the website.
The URL is further improved and now the country prefix like .uk (UK,).pk (Pakistan) etc is also used at the end of site to specify the country the site it belongs to.
As far as your question is concerned .com, .org, .edu, .net remains every where in the world irrespective of the country it resides in or belongs to.
A country code top-level domain (ccTLD) is a domain category
which is generally reserved or used for a country, a dependent territory or an
independent state. Generally, country code top-level domains contain two
letters. For instance, .US is the internet ccTLD for United States.