A Sample

A part or snippet of something taken or presented for inspection, or shown as evidence of the quality of the whole; a specimen.
(statistics) A subset of a population selected for measurement, observation or questioning, to provide statistical information about the population.
(cooking) A small quantity of food for tasting, typically given away for free.
(business) A small piece of some goods, for determining quality, colour, etc., typically given away for free.
(music) Gratuitous borrowing of easily recognised phases (or moments) from other music (or movies) in a recording.
(obsolete) Example; pattern.