An ethnic group (or ethnicity) is a group of people whose members identify with each other, through a common heritage, often consisting of a common language, a common culture (often including a shared religion) and/or an ideology that stresses common ancestry or endogamy.[1][2][3] The concept of ethnicity differs from the closely related term race in that "race" refers to grouping based mostly upon criteria that in the past have been presumed to be biological, while "ethnicity" also encompasses additional cultural factors. However, OMB defines the concept of race as outlined for the US Census as not "scientific or anthropological" and takes into account "social and cultural characteristics as well as ancestry", using "appropriate scientific methodologies" that are not "primarily biological or genetic in reference."[4]