Drag-and-drop is a user interface feature that allows users to select an item, usually with a mouse or touchpad, and move it to a different location on the screen. This is done by clicking on the item, holding down the button, and then dragging it to the desired spot before releasing the button to drop it. This functionality is commonly used in various applications, such as file management systems and graphic design software, to simplify tasks like organizing files or arranging elements. It enhances user experience by providing an intuitive way to interact with digital content.