“Foundation” is a term that carries a different meaning in Spider Solitaire than in most other versions. In many types of Solitaire, foundation piles are slowly built up, from Ace to King at the side of the tableau. However, in Spider Solitaire, the foundation piles are only created once an entire sequence has been put together in the tableau. In a way, foundation piles are not strictly necessary in Spider Solitaire. When you’ve created a full sequence you can remove it from the game and display it in any way you like. However, it’s best to display them in a way that lets you keep track of your progress, and prepare for the later stages of the game.