The Fairy type is the newest and the 18th of all of the Pokemon types. It was introduced with the games Pokemon X and Y, which are due to be released in October of 2013. Sylveon, the newest eevee evolution, was the main purpose for creating this new type because Nintendo advertised Sylveon without a type until recently. The fairy type also brings a new element to battles because it's moves are supereffective against dragon types, which were commonly known as the most invincible pokemon type there is. Now, with it being weak against fairy type moves, including dragon and ice type moves, all players will have a fair chance against dragon types.
There are currently four released fairy type pokemon: Sylveon, Gardevoir, Marill, and Jigglypuff. Sylveon is the only Eevee evolution of these pokemon and the only brand new pokemon, with the other released pokemon from previous generations. Nintendo has not released any other fairy pokemon so far.