What are "sticky" elements in user interfaces?

"Sticky" elements in user interfaces refer to interface components that remain visible during navigation, allowing users to access them easily as they scroll or move through a webpage or application. This design approach enhances usability by keeping important navigation controls, such as menus or action buttons, in a consistent position on the screen.

For example, a sticky header can help users access navigation links without having to scroll back to the top of the page, thus improving their overall experience. This feature is particularly useful in lengthy pages where constant scrolling could result in a loss of orientation within the content.

The other options focus on different aspects of design that do not align with the concept of stickiness. While difficult interaction elements and visual appeal are important considerations in UI design, they do not pertain to the persistent visibility aspect of sticky elements. Additionally, design elements that change color on hover relate more to feedback provided during interaction rather than elements that maintain their position on the screen during navigation.