"The Meaning of Tarot Cards - Where Does it Come" is a great article because it answers the title question, but in a way you might not really expect. According to the author, the real meaning of the cards isn't just a silly exercise in memorize what card "stands for" what.
If you're interested in developing a stronger understanding of Tarot cards, "The Meaning of Tarot Cards - Where Does it Come" will probably interest you a great deal.