Hopak is a Ukrainian folk dance originating as a male
dance among the Zaporozhian Cossacks, but later danced by couples, male
soloists, and mixed groups of dancers. It is performed most often as a
solitary concert dance by amateur and professional Ukrainian dance
ensembles, as well as other performers of folk dances. It has also been
incorporated into larger artistic opuses such as operas, ballets and
theatre.
The hopak is often popularly referred to as the "National
Dance of Ukraine" and has become very popular in Poland. There are
similar folkloric dance tunes known as Sirmpa in Leros, Greece.