a.k.a. mega drop-down menu, Mega Menu
The mega menu is big, has two-dimensional drop-down panels that are grouped into navigation options, they eliminate scrolling and use typography, icons, and tool tips to explain the user’s choices. They are easy to read and help the design and flow of the Web site. It renders fast, which is an important component for the interface.
There are a few downsides to the mega menu. First, they cover up a lot of content when you roll over the button so if you accidentally roll over one, the content you were looking at disappears under the menu. Also, if you have a small monitor the text on the mega menu could get jumbled and overlap, making it non-functional.
NetLingo Classification: Net Programming