Rider Waite Tarot conceived by Arthur Edward Waite
This is probably the most ubiquitous tarot deck out there. Many decks mimic the artwork and concepts for the cards. This deck has very bold and vivid colors. Some people find them to be garish.
The booklet which comes with the cards has a bit of history of tarot; the Celtic Cross spread; and brief meanings for each of the cards.
This is a good deck for readers to have in their collection as it has been the basis for so much of contemporary tarot. The editions carried by US Games are very easy to shuffle. The deck I have feels much like regular playing cards in that regard.
Rider Waite Tarot (click here for Amazon purchase)