Primary navigation text or graphic links are typically displayed at the top left, or top center, of every single page.
These links should lead to all the main departments or sections of your site. Links to utility pages, such as search, site map, feedback, help, index, and table of contents may be displayed at the top, and/or bottom, of every page.
Tab divider navigation bars are one common form of primary navigation. Instead of text links, or simple graphic icons, tab divider bars use buttons to create an illusion that a site is divided into different sections. Visit the link below for more information.