The hamburger menu is the three-line icon (☰) that opens a hidden navigation drawer. It saves screen space by hiding navigation until needed. Common on mobile sites and apps where screen space is limited. While popular, it has usability downsides—users can't see navigation options without tapping, which can reduce engagement and discoverability.
Use hamburger menus when you have limited screen space (mobile) and many navigation items that don't fit in a bottom nav or top bar. It's acceptable for secondary/utility navigation, but avoid for primary navigation if possible—visible navigation performs better. If you have 5 or fewer main sections, use bottom nav or visible tabs instead.
Navigation Patterns
Hidden drawer—three-line icon (☰), slides from side, space-saving, mobile navigation standard