The third part is the domain name . The last part is the suffix of the domain name. Some may end with uk, nz , etc, and actually are country codes. There are many more. When you pass your mouse over a hyperlink, the pointer will turn into a hand, and the web address will appear at the bottom of the browser status bar.
Web pages are a lot like books.
You usually have a table of contents, which is the home page. From the home page, the document branches out via hyperlinks which take you to other parts of the same document, or to whole other documents. A home page is usually the starting page of a document. The home page will often lead to other pages, either in the same file, or act as a hyperlink to outside sources. Text that appears in a different color and is usually underlined, that provides a link to another page.