The goal of Spider Solitaire is to remove 8 runs of Ace through King from the board. When all 104 cards are removed from the board you have won. If you have a game where you can no longer make progress and there are still cards on the board, you have lost.
Spider solitaire is played with one suit -- Spades -- and is played with two decks of cards -- 104 cards -- in total. The main rule is that a card can be placed on another card if it is one less in value. There are two secondary rules for Spider Solitaire: any card can be placed in an empty column, and a run from Ace to King will be moved to the foundation. The goal is to move 8 runs to the foundation.
Fun Solitaire has Spider, Spider (2 Suits), and Spider (4 Suits) Solitaire. In general, Spider is the easiest, Spider (2 Suits) is harder to win, and Spider (4 Suits) is the hardest Spider Solitaire game.
The Spider Solitaire foundation is where the cards go when you have built them into a run.
The deck in Spider Solitaire is where the cards are while waiting to be dealt onto the tableau. When you deal from the deck, a card is placed on each column. No columns can be empty when you deal from the deck.
The tableau in Spider Solitaire has 10 columns and the goal is to pack the cards into runs, King through Ace.