http://www.zubird.com/uniform-resource-locator-url/
There are two parts to the path. The first part is the Hyper Text Transfer Protocol and it is represented like so:
http://
For web pages that require a user name and password we add the letter “s” to indicate to the browser that the connection is secure:
https://
The second part is the domain name and location of the file or page, which may include subsequent folders or pages and file names:
www.domainname.com/category/filename.html
The actual extension for the file name may differ depending upon the technology used. Here are a few examples:
.html, .asp, .php
In the case of some Blog structures, such as WordPress (like this website), file extensions are not present. However, “Permalinks” are generated for each post or page providing added benefits for SEO and page rank. See Permalinks for more about that.






