A dropdown menu is a graphical user interface element that allows users to select an option from a list that appears when they click on a button or text. This feature is commonly used in websites and applications to save space and organize choices, making navigation easier for users. When a user clicks on the dropdown, it expands to reveal a list of options, which can include text, links, or other interactive elements. Dropdown menus are often used in forms, navigation bars, and settings, providing a simple way to present multiple choices without cluttering the interface.