Classical ballet is the system of general ballet technique and mindset which originated in the 17th century. The fundamentals of classical ballet are rigorous: aplomb, balance, turnout of the legs, dance musicality, pointe work etc. The dancers have to be attentive to vertical and horizontal body lines and keep the frontal perspective in mind too.
Nothing could describe classical ballet better than the meaning of “classic” in Latin language, which is “superior” or “of first class”. The primal form of classical ballet emerged back in Ancient Greece and later, as a part of commedia dell'arte and Italian acrobatic techniques came to popularity in France. There, with support of aristocracy, it became a decent form of art and a profession. It also gained a solid structure thanks to the head dancing-master of the Academie Royal, Pierre Beauchamp, who described arm and leg movements and invented the famous five positions, which remain the sacred rules of classical ballet to this day.