Heimin refers to the common people or the lower classes in Japan during the feudal period, particularly in the context of samurai society. This term signifies the social stratification present at the time, where heimin were often peasants or laborers who worked the land and supported the economy but had little political power compared to the ruling samurai class. The role of heimin is crucial for understanding the socio-economic dynamics and cultural practices of Japan, as well as its relations with neighboring regions, including Korea and Southeast Asia.