Solidarity

Solidarity is the integration, and degree and type of integration, shown by a society or group with people and their neighbors. It refers to the ties in a society that bind people to one another. The term is generally employed in sociology and the other social sciences. What forms the basis of solidarity varies between societies. In simple societies it may be mainly based around kinship and shared values. In more complex societies there are various theories as to what contributes to a sense of social solidarity.

taken from wikipedia