What is fairy tail ova?

i know the anime fairy tail but what is fairy tail OVA ?? cuz right now I am watching fairy tail on youtube but there is even fairy tail OVA and fairy tail OVA 2 and so on .... so does fairy tail OVA comes after fairy tail or before?? and should I what the Fairy tail OVA after Fairy tail or before ??
Asked Jun 12, 2013

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