A submenu is a secondary or additional menu that appears when a user selects an option from the main menu. However, there are some alternative terms that can be used to describe such submenus. These include dropdown menus, cascading menus, flyout menus, hierarchical menus, and nested menus. Dropdown menus tend to be the most commonly used alternative to the term submenu, as they visually represent the act of dropping down from the main menu. Cascading menus are similar to dropdown menus but with more levels, creating a cascade effect. Flyout menus appear next to the selected option, while hierarchical and nested menus visually illustrate the structure and hierarchy of the options.