First we need to know about the site pages, sites generally include the following sections:

Home: website of the facade, as the company's image, especially focusing on design and planning.
frame page: site's main page structure, also known as sub-page, inside pages, large sites tend to frame the home page, such as the number of portals. Framework of the pages within the site are mainly part of the main page, pay attention to style, consistency, and echoed in the home.
a normal page: sites carrying information on the main page, design less demanding, but requires the link is accurate, correct text, illustrations, and follow the page style.
pop-up page: is generally used in advertising, journalism, news, links to other sites, etc., usually with very little.

by the above analysis, we can see:

from a functional point of view, home is mainly responsible for establishing corporate image (of course, not just home page) role in the navigation page framework plays an important role, such as the introduction to the main content within columns are in the framework of the page reflected in re-entering the general page, enabling visitors to quickly understand the main contents of the Web site of the column, choose browse their needs, while the general information page is the main page, but also the site of the final page, for large sites, this structure is very important, and for small and medium enterprises, smaller sites, the small number of pages, and sometimes plays a common page frame page on the role, as the pop-up page, we recommend that you do not need, it is best not to use.