Solidarity is an awareness of shared interests, objectives, standards, and sympathies creating a psychological sense of unity of groups or classes. It refers to the ties in a society that bind people together as one. The term is generally employed in sociology and the other social sciences as well as in philosophy and bioethics. It is also a significant concept in Catholic social teaching; therefore it is a core concept in Christian democratic political ideology.
What forms the basis of solidarity and how it's implemented varies between societies. In developing societies it may be mainly based on kinship and shared values while more developed societies accumulate various theories as to what contributes to a sense of solidarity, or rather, social cohesion.[failed verification]
Solidarity is also one of six principles of the Charter of Fundamental Rights of the European Union and December 20 of each year is International Human Solidarity Day recognized as an international observance. Concepts of solidarity are mentioned in the Universal Declaration on Bioethics and Human Rights, but not defined clearly. As biotechnology and biomedical enhancement research and production increase, the need for distinct definition of solidarity within healthcare system frameworks is important.