What contributions did Samurai make to Japanese society?

This is quite long but explains thoroughly : D

The samurai, began as provincial warriors before rising to power in the 12th century with the beginning of the country’s first military dictatorship, known as the shogunate. As servants of the daimyos, or great lords, the samurai backed up the authority of the shogun and gave him power over the mikado (emperor). The samurai would dominate Japanese government and society until the Meiji Restoration of 1868 led to the abolition of the feudal system. The basic code of conduct for much of Japanese society.