The term "Cossack" refers to a group of predominantly East Slavic people known for their military prowess and distinct cultural identity. Historically, Cossacks emerged in the 15th century in the regions of modern-day Ukraine and Russia. They were known for their horsemanship, self-governance, and role as frontier warriors, often serving as a buffer between the Russian Empire and various neighboring territories. Cossacks formed various communities, known as "hosts," each with its own leadership and traditions. They played significant roles in military campaigns and were instrumental in the expansion of the Russian Empire. Today, Cossack culture is celebrated through music, dance, and traditional crafts, maintaining a unique heritage within Eastern European history.