Computer – Uniform Resource Locator

Each Internet service employs a particular protocol.  This specific protocol  defines the rules of engagement for computers conveying the information on that particular service.  This protocol is shown at the beginning of the Uniform Resource Locator (URL) for each site. For example, the URL for a website is frequently in the form of http://www.bloggs.com,indicating that this is an HTTP connection.

URLs are sometimes known as a Uniform Resource Identifier (URI), or popularly in short as an ‘address.’.

URLs can contain both uppercase and lowercase letters, although it doesn’t usually matter which case is used for any of the letters. In all instances, however, they can only contain standard ASCII characters, corresponding to those that you can actually see on your computer keyboard. Note that spaces or other control codes are not permitted.

Suffixes and Top-Level Domains :

Most of the time we use   .com at the end (i.e. suffix)  of the domain name.   However,  some of other common URL suffixes, are:-

Suffix	Kind of Site
.ac	Academic body
.biz	Business organisation
.co	Commercial business (not USA)
.com	Commercial business (USA or worldwide)
.coop	Co-operative organisation
.edu	Educational establishment
.gov	Civilian government
.info	Information site
.mil	Military government
.museum	Museum
.name	Named individual
.net	Network gateway
.org	Non-commercial organisation
.pro	Professional body

 With the internet become bigger and bigger, some other countries have started new suffixes, which identify the region.   An extra code is often required to identify the region, which is commonly known as the top level domain (TLD). Here are a few examples:-

TLD	Region
.eu	European Union
.fr	France
.in	India
.jp	Japan
.kr	Korea
.su	Ex-Soviet Union state
.uk	United Kingdom
.us	USA (Other sites)