Dropdown is an interactive element that allows users to select an option from a list of choices presented in a collapsible menu. It saves space on the interface by concealing the options until the user interacts with the component.

Dropdowns are typically used for form fields, action menus, or filtering lists, wherein selection from a range of options is required. They come with functionality like single or multi-selection and even search capabilities in some instances. Dropdown simplifies user interactions, ensuring a clean, efficient, and uncluttered interface.