Lenormand Cards are an alternative system of cartomancy, similar to Tarot but also different in purpose, feeling and structure. Unlike Tarot, Lenormand is a much more practical deck - focusing somewhat less on psychological feelings and instead on everyday happenings. You'll notice when reading with Lenormand decks, that these cards tend to focus on practical matters - Tarot focuses on the "why", while Lenormand tends to focus on the "how".
With 36 cards in the deck, the Lenormand system generally gives more clarity when using pairs of cards instead of individual drawings. When combined with Tarot meanings, these two systems create a powerful effect - giving you a clearer overall picture of the reading.