Mac OS X Leopard includes a new Dock feature called Stacks that allows quick access to frequently used files. Stacks are created by dragging folders to the right side of the Dock. Clicking a stack causes files within it to spring from the Dock in a fan or grid layout. Common Documents and Downloads stacks are included, and files can be dragged into stacks or saved directly to them. Stacks automatically sort files and allow customization through a contextual menu.