What is the special meaning with “AndExpand” Suffix with each LayoutOptions?

Suppose we have some elements added into the StackLayout with any of the Expand options above, all of the child elements will try to occupy more space if available to use. If StackLayout has any unused space, then the unused space is shared equally by all the child elements which request the Expansion by using “AndExpand” suffix in the Horizontal or Vertical LayoutOptions. If all the space is used in the StackLayout, then the “AndExpand” has no effect.