Some views may have several pages, which split the data up based on the values of a specific field. A common example is a view that shows a separate page for every year, quarter, or month. Pages help you compare data and find outliers. Each page uses the same axis range so as you move between the pages you can easily see how the data is changing.
If the view has pages, the page control displays so you can navigate the pages. You can use the left and right arrows to scroll through each page or use the drop-down menu in the middle to jump to a specific page. Finally, you can use the slider to scrub through the pages.
For example, in the view below, the pages are defined by Months. You can use the page control to look at sales versus profit for each month.
Select Show History on the page control to include the marks from previous pages as you move from page to page and when you select marks. The author of the view can specify how the historical marks should display. For example, the view below shows internet usage versus per capita income for countries around the world. Year is on the pages shelf so as you scroll through years you can see how internet usage has changed. History is turned on so selecting a mark shows all the values for previous years connected by a line.