Ballet (French: [balɛ]) is a type of performance dance that originated during the Italian Renaissance in the fifteenth century and later developed into a concert dance form in France and Russia. It has since become a widespread and highly technical form of dance with its own vocabulary. Ballet has been influential globally and has defined the foundational techniques which are used in many other dance genres and cultures. Various schools around the world have incorporated their own cultures. As a result ballet has evolved in distinct ways.

A ballet as a unified work comprises the choreography and music for a ballet production. Ballets are choreographed and performed by trained ballet dancers. Traditional classical ballets are usually performed with classical music accompaniment and using elaborate costumes and staging, whereas modern ballets are often performed in simple costumes and without elaborate sets or scenery.

Ballet is a French word which had its origin in Italian balletto, a diminutive of ballo (dance) which comes from Latin ballo, ballare, meaning "to dance", which in turn comes from the Greek "βαλλίζω" (ballizo), "to dance, to jump about". The word came into English usage from the French around 1630.

Classical ballet is based on traditional ballet technique and vocabulary. Different styles have emerged in different countries, such as French ballet, Italian ballet, English ballet, and Russian ballet. Several of the classical ballet styles are associated with specific training methods, typically named after their creators. The Royal Academy of Dance method is a ballet technique and training system that was founded by a diverse group of ballet dancers. They merged their respective dance methods (Italian, French, Danish and Russian) to create a new style of ballet that is unique to the organization and is recognized internationally as the English style of ballet. Some examples of classical ballet productions are: Swan Lake, The Sleeping Beauty and The Nutcracker.

Romantic ballet was an artistic movement of classical ballet and several productions remain in the classical repertoire today. The Romantic era was marked by the emergence of pointe work, the dominance of female dancers, and longer, flowy tutus that attempt to exemplify softness and a delicate aura. This movement occurred during the early to mid-nineteenth century (the Romantic era) and featured themes that emphasized intense emotion as a source of aesthetic experience. The plots of many romantic ballets revolved around spirit women (sylphs, wilis, and ghosts) who enslaved the hearts and senses of mortal men. The 1827 ballet La Sylphide is widely considered to be the first, and the 1870 ballet Coppélia is considered to be the last. Famous ballet dancers of the Romantic era include Marie Taglioni and Jules Perrot. Jules Perrot is also known for his choreography, especially that of Giselle, often considered to be the most widely celebrated romantic ballet.