Together with Oloroso, Fino is one of two major styles of the Sherry of Jerez (Spain).
In turn it includes the manzanilla, amontillado and the palma.
Details on Sherry:
Its alcoholic strength reaches from 15.5% to 17% volumetric degrees and is defended from aging by means of a yeast which form itself naturally, called "flor".
Fino is usually served cool as an aperitif.
For your information, Sherry Fino can not be aged.