What forms the basis of solidarity and how it is implemented vary between societies. In Global South societies it may be mainly based on kinship and shared values while Global North societies accumulate various theories as to what contributes to a sense of solidarity, or rather, social cohesion.
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. It is not mentioned in the European Convention on Human Rights nor in the United Nations´ Universal Declaration of Human Rights and has hence lesser legal meaning when compared to basic rights.
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