The suit of swords is one of the four suits of the minor arcana of the tarot cards. Sometimes they are called blades or knives. This suit represents the element of air, and is associated with spades in a deck of playing cards.
Full list of Swords tarot cards meanings can be found here:
Swords tarot cards
In a card reading, this suit can help you to understand the obstacles that lie before you regarding a particular person or situation. Swords can be a very challenging suit in the tarot, for they are intense, and full of a very different kind of emotion than the suit of cups. This is more brooding, more ominous, and has more thought and premeditation attached to it. Swords are also associated with thoughts--what you’re thinking, and what other people involved in the situation may be thinking, or plotting.