The UI Scrollbar object allows the user to drag a handle along a path. The position of the handle on the path affects the position of an image or objects within a usable area.
If you're having trouble seeing what a scroll bar is from the preceding description, it is most commonly used in video games with menus that have a lot of information within a viewable area that is smaller than the area that all the information takes up.
To create a UI Scrollbar, select Create | UI | Scrollbar. By default, a UI Scrollbar has a child named Sliding Area. The Sliding Area also has a child named Handle.
The Sliding Area child is an empty GameObject. Its purpose is to ensure that its child, the Handle, is correctly positioned and aligned. The Handle is a UI Image. The Handle represents the interactable area of the Scrollbar.
Unlike the Toggle and Slider GameObjects, the background...