Scrolling or scroll is the act of moving the visual portions of a window up, down, left, or right, to see additional information on the window. Below is an example of a Microsoft Windows window the user could scroll up and down using the vertical scroll bar, then left and right using the horizontal scroll bar.
Press the spacebar to scroll down one page at a time when reading a web page. Press the Shift key and spacebar at the same time to scroll up one page at a time. The page up and page down keys can also be used to move up and down one page at a time. Some people may also refer to the page up and page down keys as the scroll keys, not to be confused with the scroll lock key.