What is the function of a scroll bar in a computer display?

The function of a scroll bar in a computer display is indeed to provide a way to navigate through content that extends beyond the visible area of a window or frame. It allows users to scroll through material using a mouse, typically by clicking and dragging the scroll bar or by clicking on the arrows at either end of the bar. This is particularly useful for accessing content in documents, web pages, or software applications where only a portion of the information is displayed on the screen at one time. The scroll bar enhances usability by enabling users to easily access and view all parts of a document or application without the need to resize the window or page.

Other options relate to different functionalities that do not align with the specific purpose of a scroll bar. For instance, viewing documents in a gallery pertains more to layout or presentation features, while printing documents does not involve navigation at all. Editing text directly involves various tools for text manipulation, which again is outside the scope of what a scroll bar does.