Mega Menus are large dropdown panels (often full-width) that display many navigation options in columns, with images, icons, and descriptions. Used in top navigation for sites with lots of categories. Shows more at once than traditional dropdowns. Common in e-commerce, large content sites, SaaS.
Use mega menus for sites with many top-level categories (e-commerce, news sites, large SaaS) where simple dropdowns would be too long. Great for showcasing featured items, products, or sections with imagery. Keep to 2-3 columns max. Don't use on small sites (<10 main pages) or mobile (use hamburger menu instead).
Information Architecture
Expansive dropdown—multi-column panels, rich content, visual categories, complex navigation made simple