"Forums" is the category which all forums here are placed under. The breadcrumb (navigation bit) lists the trail from home page to the thread you're in, including every forum. E.g. if the Town Hall were put in as a subforum of the Lunatic Lounge, the breadcrumb would be like this:
Off Topic Central > Forums > Lunatic Lounge > Town Hall > thread name
and if Town Hall were moved out of the Forums category, it would look like this
Off Topic Central > Town Hall > thread name
Hopefully I said that well enough to be understood.
Once we get a front page, its behavior will probably be changed, e.g. "Forums" (instead of "Off Topic Central") will go to the main forum index page.